近义词: 突然sudden
adj. 突然的，意外的；快速的
n. 突然发生的事
A sudden change of her face makes him scared.
她突然变脸使他感到害怕。
There was a sudden rain and everybody got wet.
突如其来的雨把每个人都淋湿了。
It happened all of a sudden, and we were all surprised.
事发突然，我们都很惊讶。
Don't make any sudden moves around animals.
不要在动物周围做任何突然的动作。
