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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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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In lab tests using blood samples from human volunteers, the scientists showed that a drop of blood placed on the strip caused a color change that indicated blood type.

研究人员从志愿者身上采集血液样本用于试验，将血液滴在试纸上，根据试纸颜色的变化来区分血型。

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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

They were willing to change the accent color from red to blue, or maybe green if we pushed them.

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In lighting, for instance, we've seen the development of light bulbs that can not only be turned on and off (and dimmed) via WiFi, but also change color -- from companies as diverse as lighting giant Philips and Kickstarter campaigner LIFX.

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First it's the roar of F-16 jets from a nearby NATO base, then a hailstorm, then torrential rains that change the color of the desert so that previous shots won't match new ones.

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