1. 球棒；球拍
    A bat is a specially shaped piece of wood that is used for hitting the ball in baseball, softball, cricket, rounders, or table tennis.

    e.g. ...a baseball bat.
           棒球球棒

2. 轮到击球
    When you bat, you have a turn at hitting the ball with a bat in baseball, softball, cricket, or rounders.

    e.g. Australia, put in to bat, made a cautious start.
           轮到澳大利亚队出场击球，他们开始打得很谨慎。

3. 蝙蝠
    A bat is a small flying animal that looks like a mouse with wings made of skin. Bats are active at night.

4. see also: old bat

5. 连眼睛也不眨一下；镇定自若；泰然处之
    When something surprising or shocking happens, if someone doesn't bat an eyelid in British English, or doesn't bat an eye in American English, they remain calm and do not show any reaction.

6. 支持；为…出力
    If you go to bat for someone or go in to bat for them, you give them your support.

    e.g. The old judge doesn't like the thought of no one going in to bat for the accused.
           老法官不希望没有人为被告辩护。

7. （开车）飞一般地，风驰电掣地，飞快地
    If you drive like a bat out of hell, you drive extremely fast.

    e.g. He took off for Helsinki like a bat out of hell.
           他飞快赶往赫尔辛基。

8. 独立地；自主地；主动地
    If someone does something off their own bat, they do it without anyone else suggesting it.

    e.g. Whatever she did she did off her own bat. Whatever she did was nothing to do with me.
           她所做的一切都是她自己主动要做的。她做的任何事都与我无关。

9. 马上；立刻
    If something happens right off the bat, it happens immediately.

bat的翻译

    e.g. He learned right off the bat that you can't count on anything in this business.
           他立刻明白在这一行业中不能依靠任何东西。