throw off/out, fling off, give forth/off/out, send forth 与 send out 这些短语均可表示“发出，冒出”之意，用于光、热、烟、气味等，其中send forth用法较旧。
- When the material burns, it throws off/out (=gives forth/off/out, flings off, sends forth/out) a nasty smell and a lot of smoke.
这种材料燃烧时，会散发出难闻的气味和浓烟。 - That damned factory is always giving off a thick black smoke.
这家该死的工厂总是冒着黑色浓烟。 - This flute gives forth/out/off a special sound very pleasant to the ear.
这只笛子发出一种非常悦耳的特殊声音。 - Look, the plant that I thought was dying is sending out new leaves!
看，我原以为那棵植物要死了，它却长出新叶来了！
