give ⁸

give off 与 give out 虽然都译作“发出”或“放出”，但它们的搭配关系是不同的。give off 的宾语通常是气体、液体、烟、雾、气味、放射线、光等等，而 give out 的宾语通常是光、声、电、热、放射线等等：

1. Boiling water gives off steam. 沸水散发蒸汽。

2. The eggs were giving off a bad smell. 这些鸡蛋发出一股难闻的气味。

3. Not long before another scientist had found that uranium gave off rays, so Marie decided to study this area for her doctor's degree. 前不久，另外有位科学家发现过铀元素放出射线的现象，于是玛丽便决定在这方面进行研究，以获取博士学位。

4. The sun gives out light and heat to the earth. 太阳给地球散发光和热。

5. The ship gave out radio signals for help until she sank. 该船沉没以前，一直发出无线电求救信号。

6. This special whistle gives out(gives forth) a sound that only dogs can hear. 这种特殊的口哨发出的声音只有狗才能听见。

[附注]当宾语为 radiation 时,既可用 give out,也可用 give off:

1. In 1898 they declared that they believed there was something in nature which gave out radiation. (旧高中英语课本,3,p.6) 1898年,他们宣布,他们相信在自然界中有某种能发出放射线的物质。

2. A certain scientist had discovered that a metal called uranium gave off a kind of radiation. （同上）有一位科学家发现，有一种叫做铀的金属能放出一种放射线。