1. 小虫；臭虫
    A bug is an insect or similar small creature.

    e.g. We noticed tiny bugs that were all over the walls.
           我们注意到墙上爬满了小虫子。
    e.g. ...a bloodsucking bug which infests poor housing.
           贫民区滋生的一种吸血的虫子

2. 小病；轻微的传染病
    A bug is an illness which is caused by small organisms such as bacteria.

bug

    e.g. I think I've got a bit of a stomach bug...
           我想我的胃可能出了点儿毛病。
    e.g. There was a bug going around at the club.
           这个俱乐部流行着一种轻微的传染病。

3. （计算机程序中的）漏洞，错误，故障
    If there is a bug in a computer program, there is a mistake in it.

    e.g. There is a bug in the software.
           软件有漏洞。

4. （微型）窃听器
    A bug is a tiny hidden microphone which transmits what people are saying.

    e.g. There was a bug on the phone.
           电话装有窃听器。

5. 在…装窃听器
    If someone bugs a place, they hide tiny microphones in it which transmit what people are saying.

    e.g. He heard that they were planning to bug his office...
           他得知他们打算在他办公室安装窃听器。
    e.g. I found out my phone was bugged.
           我发现我的电话被窃听了。

6. （对…的）热衷，迷恋
    You can say that someone has been bitten by a particular bug when they suddenly become very enthusiastic about something.

    e.g. I've definitely been bitten by the gardening bug...
           我被园艺彻底迷住了。
    e.g. Roundhay Park in Leeds was the place I first got the fishing bug.
           利兹市的朗德海公园是我首次对钓鱼着迷的地方。

7. 使烦恼；使厌烦
    If someone or something bugs you, they worry or annoy you.

    e.g. I only did it to bug my parents.
           我这么做只是为了让我父母心烦。