请先听一遍，再看原文；请尽量模仿原声复述，最后做口语练习。
1. If you ever need someone to fix your computer, ask Bob, he really knows his onions!
2. Look, you got full marks in the maths test – you really do know your onions.
3. If someone says you know your onions, it means you are experienced in something or you know a lot about a particular subject. So really, it means you’re clever!
译文：
1. 如果你需要别人帮你修电脑，问一下鲍勃，他在这方面很在行。
2. 瞧，你在数学测验得满分 – 你真行。
3. 如果有人说你 know your onions，意思是你在某方面很有经验，或者你对某个科目知道得很多；也就是说，你很聪明。
know one’s onions = very knowledgeable about something [非正式]（在某方面）知识渊博的，知道得很多，很在行
口语练习：
When my computer broke down, Xiao Li came to help. He really know his onions in computer.
My classmate Xiao Zhang got full marks in TOEFL. She really knows her onions in English.
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