tropic + noun
tropic 作形容词时通常放在名词前作定语，意思相当于 tropical，多用来描写气候、阳光、海域等。
Tropic heat made the afternoon unbearable.
热带的高温让午后难以忍受。
（指天气或气候）像热带一样的，炎热潮湿的；间接引起生物或化学变化的；比喻的；转义的；修辞格的；热带的；与热带有关的。；间接引起系统或底物中生物或化学变化的特性。
热带的；与热带有关的。
Of, or relating to the tropics; tropical.
间接引起系统或底物中生物或化学变化的特性。
Having the quality of indirectly inducing a biological or chemical change in a system or substrate.
与热带有关或位于赤道两侧的地区
relating to or situated in or characteristic of the tropics (the region on either side of the equator)
与转义或比喻相关的；具有转义或比喻性质的。
Pertaining to, involving, or of the nature of a trope or tropes.
天气或气候；像热带一样炎热潮湿
of weather or climate; hot and humid as in the tropics
Many birds in this zoo come from tropic areas and need warm, humid air.
这个动物园里的许多鸟类来自热带地区，需要温暖潮湿的空气。
用法提示：tropic 作形容词，修饰 areas，表示‘热带的’。
The tropic sun was so strong that we stayed indoors all afternoon.
热带的阳光太强，我们整个下午都待在室内。
用法提示：tropic 作形容词，修饰 sun，表示‘热带的’。
The farmer built a greenhouse to give his mango trees a tropic climate in winter.
农夫建了一座温室，让他的芒果树在冬天也能有热带气候。
用法提示：tropic 作形容词，修饰 climate，表示‘热带气候’的。
tropic 作形容词时通常放在名词前作定语，意思相当于 tropical，多用来描写气候、阳光、海域等。
Tropic heat made the afternoon unbearable.
热带的高温让午后难以忍受。
grammar · medium
易错句子Thailand is in the tropic.
正确表达Thailand is in the tropics.
表示“热带地区”这一整片区域时，英语固定用复数名词 the tropics，单数形式不能指整个热带；把 tropic 变成复数 tropics 后才与汉语“热带”对应。汉语“热带”没有单复数区分，学习者常直接套用单数。
grammar · medium
易错句子Bananas grow in tropics.
正确表达Bananas grow in the tropics.
the tropics 是表示热带地区的固定说法，定冠词 the 必须保留，用来特指赤道两侧的热带区域；汉语名词前不加冠词，学习者容易把 the 整体漏掉。
热带鸟，鹲
The tropic bird soared gracefully over the ocean.
热带鸟在海洋上空优雅地翱翔。
促激素
The pituitary gland produces tropic hormones that control other glands.
垂体产生促激素，控制其他腺体。
回归年
The tropic year is approximately 365.2422 days long.
回归年大约有365.2422天长。
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