通过改变黑色线条或者铰链的宽度，研究员可以改变每条铰链可以折叠的范围。

By varying the width of the black lines, or hinges, researchers are able to change how far each hinge folds.

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他的眼睛变黑色，而且他打开了他的嘴显示，乔渴望越过他的唇凸出的犬齿。

His eyes went black and he opened his mouth to show Joe long canines that protruded past his lips.

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在皮肤开始变黑之前，黑色素就有可能提供最及时的紫外线防护。

This is likely to provide rapid protection against UV damage, long before the skin starts to tan.

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