cyberspace
电脑空间  

例句：
The thing about cyberspace is that everything is the same distance away, no further than your computer screen.
在电脑空间里，所有东西离你都是一样的距离，不会比到你的计算机屏幕的距离更远的。
 

come in handy
有用得着的时候
 
例句：
Don't throw those old textbooks away; they may come in handy some day.
别把那些旧书扔掉，也许哪天能用得着。
 

You are kidding.
你在开玩笑吧。 

对话：
A: Laura, I want to get rid of my car.
B: You are kidding. I know you like your car very much.
A: No. I mean it.

A：劳拉，我想卖掉我的车。
B：你开玩笑吧。我知道你非常喜欢你的车。
A：不，我是认真的。