1、knock off

使减少；使降低

Udinese have knocked 10% off admission prices.

乌迪内斯队将入场费降低了10%。

He has knocked 10 seconds off the world record.

他将世界纪录缩短了10秒。

下班；收工

If I get this report finished I'll knock off early.

如果我写完这篇报告，我就会早点下班。

What time do you knock off?

你什么时间下班？

杀死

He had many motives for wanting to knock off Yvonne.

他有很多杀伊冯娜的动机。

People don't just knock one another off like this unless there's big money at stake.

如果不是为了冒险赚大钱，人们不会像这样彼此残杀。

2、definite

明确的;确定的

It's too soon to give a definite answer.

要给出一个明确的答复，现在还为时过早。

Her Royal Highness has definite views about most things.

女王陛下对大多数事情都有明确的观点。

(证据或信息)确凿的，确切的

We didn't have any definite proof.

我们没有任何确实的证据。

If you have any definite news of my husband, please let me know.

如果有我丈夫的确切消息，请一定告诉我。