22 篇文章
In the tropics the sun's rays strike the earth head on
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In the tropics the sun's rays strike the earth head on 在热带地区 太阳辐射直射大地

At these latitudes the sun's rays are glancing
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At these latitudes the sun's rays are glancing 在这个高纬度地区 太阳辐射只能斜射到这片土地