Give off 表示散发气味、热量、光或气体。它也可以表示给人某种印象、展现某种气质：give off an air of confidence。日常也会与 vibe 搭配：He gives off a friendly vibe。
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give off + heat/light/smell/gas; give off + an air of + noun; give off a friendly/calm vibe
- This small heater gives off enough heat to warm the whole bedroom.
- The milk had been left out all day and was giving off a sour smell.
- Even on her first day, the new manager gave off an air of calm confidence.
修改原因
修改前This small heater gives off a lot of warm, so we rarely turn on the central heating.
修改后This small heater gives off a lot of heat, so we rarely turn on the central heating.
Warm 是形容词，不能直接放在 a lot of 后面。这里要说明散发的是什么，需要名词 heat 或 warmth。
Give off 和 give away 都能涉及从一个人身上察觉到的事，但意思不同。Give off 指传递的印象：She gives off an air of calm。Give away 则表示暴露了本来想隐藏的事：Her shaking hands gave away how nervous she was。
动手练习
Nobody wanted to sit near the bin because it was ___ a horrible smell.
查看答案
giving off — 难闻的气味从垃圾桶散发出来，应选 give off：it was giving off a horrible smell。Give away 可以表示免费送出或泄露秘密，不能表达这里垃圾桶散发气味的动作。
描述一个因为气味而让你记住的地方，例如厨房、市场、森林或咖啡馆。说明气味来自什么，以及是什么味道。
In my grandmother's kitchen, the fresh bread on the table always gave off a sweet, warm smell.
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