1、knock off

使減少；使降低

Udinese have knocked 10% off admission prices.

烏迪內斯隊將入場費降低了10%。

He has knocked 10 seconds off the world record.

他將世界紀錄縮短了10秒。

短下班；收工

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

如果我寫完這篇報告，我就會早點下班。

What time do you knock off?

你什么時間下班？

殺死

He had many motives for wanting to knock off Yvonne.

他有很多殺伊馮娜的動機。

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

如果不是為了冒險賺大錢，人們不會像這樣彼此殘殺。

2、expression

表達;表述

Laughter is one of the most infectious expressions of emotion.

笑是最具感染力的情感表達方式之一。

From Cairo came expressions of regret at the attack.

開羅對此次攻擊表示遺憾。

表情;神情

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

然而，那位公務員的表情還是那樣，絲毫沒變。

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

萊文坐在那里，神情悲傷。