Viruses tend to be good at surviving when a computer system crashes.

　　計算機病毒在系統崩潰后往往依然存在。

　　You have to be good at spotting trouble on the way and heading it off.

　　你必須善于發(fā)現潛在的麻煩并加以化解。

　　A teacher should be good at drawing inferences about other cases from one instance.

　　老師要善于舉一反三。

　　It is not something that just anyone can be good at.

　　它不是任何人都可以勝任的。

　　If you only listen to what others speak, you will be good at listening.

　　如果你只聽別人說話，那么你就是善于傾聽的。