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Dialogue Six   Saying Farewell at the Airport
 
 by any chance
  万一,也许
If by any chance you need my help, please never hesitate to ring me up.
万一你需要我的帮助,请尽管打电话给我。
Have you got a spare stamp by any chance?
你也许碰巧有多余的邮票吧?
by chance:偶然,碰巧
It happened quite by chance.
这完全是偶然发生的。
I got this job completely by chance.
我得到这份工作纯属偶然。
 call on/upon
  访问,拜访
We called on the Whites on the way north.
我们去北方的途中拜访了怀特一家。
注意call on 的另一个含义:
I now call on the best man to make a speech.
我现在请男傧相讲几句话。(号召,要求)