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1·Darkness falls quickly in the tropics.

在热带地区夜幕降临迅速。《牛津词典》

2·Night descends quickly in the tropics.

热带地区黑夜来得快。《牛津词典》

3·The waters of the tropics are invitingly clear.

热带地区的水域清澈诱人。《柯林斯英汉双解大词典》

4·In the tropics plants grow to huge proportions.

在热带，植物长得很高大。《柯林斯英汉双解大词典》

5·The disease is thought to have originated in the tropics.

这种疾病据说起源于热带地区。《牛津词典》

6·Being in the tropics meant that insects formed a large part of our life.

身处热带地区意味着昆虫成了我们生活的一大部分。《柯林斯英汉双解大词典》

7·Even within the tropics, language diversity varies widely.

即使在热带地区，语言的多样性也有很大的差异。

8·The larger the iceberg, the slower it melts, even if it is towed through the tropics.

冰山越大，融化的速度就越慢，即使它被拖着穿过热带地区。

9·It ranges from sea level in the Polar Regions to 4,500 meters in the dry subtropics and 3,500-4,500 meters in the moist tropics.

它的范围包括海平面的极地地区、4500米高的干燥的亚热带地区以及3500-4500米高的潮湿的热带地区。

10·The mightiest are native to North America, but big trees grow all over the globe, from the tropics to the boreal forests of the high latitudes.

最高大的树原产于北美，但大树遍布全球——从热带到高纬度的北方森林。

(1)tropic of cancer北回归线

(1)tropic of capricorn[天]南回归线