give off是什么含义啊!请指教啊

发散
The food gave off a bad smell.
食物已经发臭了.
To give off gas.
释放气体
To give off vapor.
放出蒸汽
To give off; emit.
发出；散发
To give off; exude.
渗出,发出
Arteries give off many branches.
动脉分出许多支脉.
Chemical changes that give off energy.
释放能量的化学变化
To form or give off bubbles.
起泡；冒泡
To give off soot or color.
发出煤烟色,脱色
give off (water) through the skin.
通过皮肤向外散发水份.
We give 5% off for quick settlement.
为了迅速结帐,我们降价5%.