During autumn, the leaves changecolor and fall down from the trees.
在秋天，树叶变了颜色，从树上掉下来。
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According to entomologists, single locusts are quiet creatures, but when locusts are placed with others of their species, they become excited, changecolor, vibrate, and even hum.
By sucking sap from the young twigs of the hemlock tree, tree growth is retarded by the woolly adelgid, causing needles to changecolor from deep green to grayish green and to drop prematurely.