A：(Supposedly/ I heard/ they say), it was the first time he did heroin.
      （据称/我听说/他们说），这是他第一次吸食海洛因。

B：Oh, my god.
      喔，天哪。

A：Why do you want to take these courses?
      你为何想报读这些课程？

B：I want to become certified in (computer programming/ first aid/ child education).
      我想获得（电脑编程/急救/儿童教育）方面的合格证书。

B：Would you like (a window or an aisle seat/ smoking or non-smoking/ first or business class)?
      你想要一个（靠窗还是靠过道的座位/吸烟还是非吸烟区/头等舱还是经济舱）的座位？

A：An aisle/ window seat. / Smoking./ Non-smoking. / First class./ Business class.
      靠过道/还是靠窗的座位/吸烟/非吸烟区/头等舱/经济舱。

1. 最早的;最先的;第一位的
    The first thing, person, event, or period of time is the one that happens or comes before all the others of the same kind.

    e.g. She lost 16 pounds in the first month of her diet.
           她节食的头一个月就减掉了16磅。
    e.g. ...the first few flakes of snow...
           初落的几片雪花

2. 最早;最先;先
    If you do something first, you do it before anyone else does, or before you do anything else.

    e.g. I do not remember who spoke first, but we all expressed the same opinion...
           我不记得是谁最先发言的，但我们全都表达了相同的看法。
    e.g. First, tell me what you think of my products...
           先谈谈你觉得我的产品怎么样吧。

3. 第一(次)的;首(次)的
    When something happens or is done for the first time, it has never happened or been done before.

    e.g. This is the first time she has experienced disappointment...
           这是她第一次感受到失望。
    e.g. It was the first occasion when they had both found it possible to keep a rendezvous.
           他们两人都能赴约，这还是头一遭。

4. 首次出现的事物;首例
    An event that is described as a first has never happened before and is important or exciting.

    e.g. It is a first for New York. An outdoor exhibition of Fernando Botero's sculpture on Park Avenue.
           在公园大道上露天展出费尔南多·博特罗的雕塑，这在纽约还是破天荒的事。

5. 第一次;首次
    The first you hear of something or the first you know about it is the time when you first become aware of it.

first

    e.g. We heard it on the TV last night — that was the first we heard of it...
           昨晚我们在电视上听到了这件事——那是我们头回听说。
    e.g. When Mark arrived home that afternoon, it was the first he knew for sure of the surprise party.
           马克那天下午回到家时是他第一次确切知道有惊喜派对这回事。

6. 最初;起初;开始
    You use first when you are talking about what happens in the early part of an event or experience, in contrast to what happens later.

    e.g. When he first came home he wouldn't say anything about what he'd been doing.
           刚回到家时，他只字不提自己一直在做什么。

7. (强调不愿意做某事)宁可，宁愿
    In order to emphasize your determination not to do a particular thing, you can say that rather than do it, you would do something else first .

    e.g. Marry that fat son of a fat cattle dealer? She would die first!
           嫁给那个大腹便便的牛贩子的胖儿子？她宁愿去死！

8. (用于列举条目)第一，首先
    You use first when you are about to give the first in a series of items.

first的近义词

    e.g. Certain guidelines can be given. First, have a heating engineer check the safety of the system.
           可以提供一些指导原则：第一，找位供暖工程师检查系统的安全性。

9. (一列中)离得最近的，最前面的
    The first thing, person, or place in a line is the one that is nearest to you or nearest to the front.

first的反义词

    e.g. Before him, in the first row, sat the President...
           在他面前第一排坐着总统。
    e.g. First in the queue were two Japanese students.
           队伍最前面是两个日本学生。

10. 首要的;头等的
    You use first to refer to the best or most important thing or person of a particular kind.

    e.g. The first duty of any government must be to protect the interests of the taxpayers...
           任何政府的首要职责都必须是保护纳税人的利益。
    e.g. Imagine winning the local lottery first prize of £5,000.
           想象一下中个5,000英镑的当地彩票头奖吧。

11. (用于工作或职位的头衔中)最高的
      First is used in the title of the job or position of someone who has a higher rank than anyone else with the same basic job title.

      e.g. ...the First Lord of the Admiralty.
             海军大臣
      e.g. ...the first mate of a British tanker.
             一艘英国油轮的大副

12. (英国大学的)优等学位，一级荣誉学位
      In British universities, a first is an honours degree of the highest standard.

      e.g. ...an Oxford Blue who took a First in Constitutional History.
             获得宪法史优等学位的牛津大学校队运动员

13. 第一;首先
      You use first of all to introduce the first of a number of things that you want to say.

      e.g. The cut in the interest rates has not had very much impact in California for two reasons. First of all, banks are still afraid to loan.
             降息在加利福尼亚并未产生多大影响，原因有二。首先，银行仍然不敢放贷。

14. 最初;起初;开始时
      You use at first when you are talking about what happens in the early stages of an event or experience, or just after something else has happened, in contrast to what happens later.

      e.g. At first, he seemed surprised by my questions...
             起初，他似乎对我的问题感到惊讶。
      e.g. I had some difficulty at first recalling why we were there.
             刚开始回想我们为什么会在那儿时我有些费劲。

15. 居于首要地位;占据头等位置
      If you say that someone or something comes first for a particular person, you mean they treat or consider that person or thing as more important than anything else.

first

      e.g. There's no time for boyfriends, my career comes first.
             我没时间交男朋友，事业对我来说是第一位的。

16. 先到先接待;先到先供应;按先来后到对待
      You say 'first come first served' to indicate that a group of people or things will be dealt with or given something in the order in which they arrive.

      e.g. There will be five buses, first come first served.
             会有5辆巴士，先到先上。

17. 从最初;从一开始
      From the first means ever since something started.

first的解释

      e.g. You knew about me from the first, didn't you?...
             从一开始你就知道我，对吧？
      e.g. I thought from the first that she was a little unsure about that marriage.
             从一开始我就觉得她对那桩婚事心里没底。

18. 第一手地;直接;亲自
      If you learn or experience something at first hand, you experience it yourself or learn it directly rather than being told about it by other people.

first

      e.g. He arrived in Natal to see at first hand the effects of the recent heavy fighting.
             他来到纳塔尔亲自了解最近发生的激烈冲突造成的后果。

19. 对…一无所知;对…毫不知晓
      If you say that you do not know the first thing about something, you are emphasizing that you know absolutely nothing about it.

first是什么意思

      e.g. You don't know the first thing about farming.
             你对种地一窍不通。

20. 第一;首先
      You use first off to introduce the first of a number of things that you want to say.

      e.g. First off, huge apologies for last month's confusing report.
             首先，要对上个月那篇交代不清的报道表示深深的歉意。

21. 视…为最重要;把…放在首位
      If you put someone or something first, you treat or consider them as more important than anything else.

first

      e.g. Somebody has to think for the child and put him first.
             必须有人替孩子着想，把他放在第一位。

22. 最重要的先做;最要紧的先处理
      You say 'first things first' when you are talking about something that should be done or dealt with before anything else because it is the most important.

      e.g. Let's see if we can't find something to set the mood. First things first; some music.
             看看我们能不能找点什么烘托一下气氛。当务之急：来点音乐吧。

23. first and foremost -> see foremost