During autumn, the leaves change color 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, change color, vibrate, and even hum.

根据昆虫学家的说法，单个的蝗虫是安静的生物，但是当它们和同类的其他蝗虫放在一起时，它们会变得兴奋，变色，振动，甚至嗡嗡叫。

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By sucking sap from the young twigs of the hemlock tree, tree growth is retarded by the woolly adelgid, causing needles to change color from deep green to grayish green and to drop prematurely.

通过吮吸铁杉幼嫩枝的汁液，树木的生长被毛茸茸的叶蝉阻碍，导致针叶从深绿色变为灰绿色，并提早掉落。

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The leaves on many of the trees have already begun to change color as they prepare to drop to the ground.

VOA: special.2009.09.21

For example,they change color to protect themselves from enemies.

VOA: special.2010.01.04

Your eyes change color. And sometimes you speaklike you're from a different time.

VOA: standard.other

These companies rely on microscopic beads that change color when voltage is applied to them.

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Toast the fennel seeds in a small skillet over medium heat just until they start to change color.

NPR: Recipe: 'Good Day for a Picnic'

The irises may also change color and lose some of their translucence.

CNN: Albinism