1、remain

保持;继续;持续

The three men remained silent.

这3个人保持着沉默。

The situation remains tense.

形势持续紧张。

留在，停留于(某处)

He will have to remain in hospital for at least 10 days.

他至少得在医院里呆10天。

From time to time, James remained at home with his family.

詹姆斯偶尔留在家里陪家人。

仍然存在;继续存在

Many of the differences in everyday life remain.

日常生活中的许多差异仍然存在。

The wider problem remains..

更普遍的问题仍未解决。

残余（物）;剩余（物）;遗迹

They were tidying up the remains of their picnic.

他们正在收拾野餐后剩下的东西。

the charred remains of a tank.

烧焦的坦克残骸

2、drop off

打瞌睡;睡着

I must have dropped off to sleep.

我肯定是睡着了。

Just as I was dropping off, a strange thought crossed my mind.

就在我打瞌睡的时候,一个奇怪的念头闪过我的脑海。

减退;减少

Sales to the British forces are expected to drop off.

预计对英国军队的销售量会减少。

The daily toll of casualties has dropped off sharply.

每日伤亡人数已经大大减少。

3、revolutionary

革命的

Do you know anything about the revolutionary movement?

你了解这场革命运动吗？

the Cuban revolutionary leader, Jose Marti.

古巴革命领导人何塞·马蒂

革命性的;突破性的;发生重大变革的

Invented in 1951, the rotary engine is a revolutionary concept in internal combustion.

1951年发明的转缸式发动机是内燃机领域内的革命性概念。

His playing as a trumpet player was quite revolutionary.

他的小号演奏独创一格。