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。

短下班；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、expression

表达;表述

Laughter is one of the most infectious expressions of emotion.

笑是最具感染力的情感表达方式之一。

From Cairo came expressions of regret at the attack.

开罗对此次攻击表示遗憾。

表情;神情

The civil servant's expression, however, did not change, not so much as by a flicker.

然而，那位公务员的表情还是那样，丝毫没变。

Levin sat there, an expression of sadness on his face.

莱文坐在那里，神情悲伤。