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陽光因為是沿直線傳播的,所以樹恭弘=叶 恭弘就擋住了光.當然樹恭弘=叶 恭弘進行光合作用就吸收了部分的太陽能,而只有一部分的能量被大樹底下的泥土吸收.又泥土的比熱容小,所以與外邊的泥土相比溫差就很大了.因此大樹底下好乘涼
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