vehicle (n.)
交通工具
例句：
When you travel, what kind of vehicle do you use?
当你旅行时，你都喜欢用什麽样的交通工具?
carry a chip on one's shoulder
以挑衅的态度出现
例句：
He is very difficult to deal with...he's always carried a chip on his shoulder about his lack of education.
他这个人很难对付……由于没能受到良好的教育，他整天都像要跟人家打架似的。
Don't mention it!
不必客气。
对话：
A: Excuse me, can I use your telephone?
B: Of course. Go ahead.
A: I'm sorry to bother you. But my phone hasn't been installed yet.
B: Don't mention it. You are welcome(at any time).
A：请问，我能用一下你的电话吗？
B：当然可以。用吧。
A：很抱歉打扰你。我的电话还没有装上。
B：不必客气。(随时)欢迎你来。