The coming drop in temperature of your body will naturally make you feel sleepy.

身体温度的下降自然会让你感到困倦。

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There was a marked drop in temperature.

气温显著下降。

《新英汉大辞典》

They form where giant loops of magnetism, generated deep inside the sun, well up and burst through the surface, leading to a localised drop in temperature which we see as a dark patch.

当太阳内部深处形成巨大的磁力环，该处将会产生井喷并突破太阳表面，从而使表面的局部地区温度下降，看上去就像一个暗斑，这就是黑子的形成。

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"So-called 'sceptics' should now drop their thoroughly discredited claims that the increase in global average temperature could be attributed to the impact of growing cities, " he said.

BBC: Global warming 'confirmed' by independent study