夏天的树叶是绿色的，因为它们富含叶绿素，这种捕捉阳光的分子可以将这些能量转化为新的树木生长材料。
Summer leaves are green because they are full of chlorophyll, the molecule that captures sunlight converts that energy into new building materials for the tree.
夏天的树叶色调是凝重暗沉的，春天的书页则轻盈透亮。
Summer leaves will be dark, shading, but spring leaves let the light through.
通常，我在傍晚进去，特别是在夏天和秋天，那时华府的空气温暖，而且寂静，树上的树叶几乎不会发出瑟瑟声。
Usually I go in the early evening, especially in the summer and fall, when the air in Washington is warm and still and the leaves on the trees barely rustle.
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