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Climate-the weather conditions prevailing in an area in general or over a long period. 氣候
Gravity-萬有引力
neat-巧妙
constant - 衡長不變
very-differ in size, amount, degree, or nature from something else of the same general class 變化
trench-a long, narrow ditch. 溝
polar -極區
catchment-集水區
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