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1·For centuries he braved arctic cold, tropic heat and inhuman privations to wrest gold from the earth.

几个世纪以来，他冒着北极的严寒、热带的酷暑和非人的贫困，从地球上攫取黄金。

2·According to scientific results, on Winter solstice, a right angle is formed by the sun and the tropic of carpricorn.

根据科学的结果，在冬至，太阳和南回归线形成了一个直角。

3·We must protect tropic forests.

我们必须保护热带雨林。

4·The tropic sun glared down on us all day.

热带的太阳整日灼晒着我们。

5·How to light the Tropic of Capricorn?

怎么点亮南回归线？

6·The tropic sun glared down on us all day.

热带太阳整天强烈照射我们。

7·His hometown is located in the north to the tropic of cancer.

他的家乡在北回归线的北面。

8·Dry rosin is best in tropic and soft rosin in cold climate.

干的松香在热带最适用，而软的松香适用于寒冷的气候。

9·You will need a mosquito net to keep off the tropic insects.

你需要一个蚊帐以防热带昆虫叮咬。

10·Why? Is it only because tropic zone has a higher temperature?

为什么会出现这种情况？仅仅是因为热带比寒带更热？

(1)tropic of cancer北回归线

(1)tropic of capricorn[天]南回归线