Whether or not we're successful, we can be sure that we did our best.

　　不管成功與否，我們確已盡了最大努力。

　　We're debating whether or not to go skiing this winter.

　　我們盤算著今年冬天是否去滑雪。

　　This blood test will show whether or not you're immune to the disease

　　這個血檢會顯示你是否對這種疾病具有免疫力。

　　They now have two weeks to decide whether or not to buy

　　現在他們有兩周時間決定到底買還是不買。

　　It is debatable whether or not antibiotics would make any difference

　　抗生素能否起到什么作用還無法定論。