give out和give off的区别

give off通常用来表示“散发，发出”某种气体或气味。give out 则通常用来表示“散发”某种光，声，热，信号等物理现象，此外，它还可以表示“分发，宣布，耗尽”等现象。

give off例句：

Boiling water gives off steams. 开水散发出蒸汽。 

This milk must be bad, for it is giving off a nasty smell. 牛奶一定变质了，因为它散发出一种令人恶心的气味。

give out例句：

The leaves gave out a whirring sound. 树叶发出沙沙声。 

The sun gives out light and heat to the earth. 太阳向地球发出光和热。