The acid acts on the metal and a gas is given off.

这种酸使金属起反应，并放出气体。

One of them is a harmless hormone given off by potatoes.

其中之一是一种无害的土豆激素。

Heat and light can be given off by this chemical change.

这种化学反应能放出热和光。

An unpleasant smell is given off by that piece of burnt plastic.

这股怪味是那块焦烂的塑料发出的.

They become less sensitive to the needs and social cues given off by others.

他们不再去留意别人的需求，也对社会讯息反映冷淡，更有甚者会亵渎正常的行为规范。

Rising concentrations of these gases are then analysed in order to draw conclusions about the amount of gas being given off by a given surface area.

然后对这些气体的浓度增升进行分析，以得出某个给定表面区域所释放的气体量。

The factory has given off poisonous gases and done great harm to the surrounding villages.

工厂释放出有毒气体，对周围的村庄造成极大的危害。

Mary Lou got up, gathered her books and—without a tear shed or retort given—off she went.

玛丽·路站起来，拾起她的书走了，没有流一滴眼泪，也没有反击。

The color of the rays given off by a fire depends on the temperature and on what is being burned.

火发出的光线的颜色，取决于温度和被燃烧的物质的种类。

It scans for smells and for tiny electric signals given off by the bodies of hidden creatures.

因为躲藏者的味道和生物电出卖了它，肩章鲨也可以侦测到。