'you basically let the crystal fall on something, black or dark-colored, and then you have to pick it up with a toothpick or brush and put it on a glass slide,' Libbrecht said.

'基本上就是让晶体落在黑色或深色的背景上，然后用个牙签或刷子把它弄到玻璃幻灯片上，'利波瑞特介绍说。

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In his book "Worrying," Francis o 'gorman notes how quickly the good kind of anxiety can slide into the dark kind.

弗朗西斯·奥戈尔曼(Francis oGorman)的《忧虑》(Worrying)一书指出，好的焦虑也可以很快变成阴暗的焦虑。

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And then, as he looked at one tree he saw a great load of snow slide off it and for the first time since he had entered Narnia he saw the dark green of a fir tree.

随后，当他看着一棵树时，他看见一大块积雪从树上滑落下来，这是他进入纳尼亚以来第一次看见一棵冷杉树的深绿色。

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While many hope the improved transatlantic coordination will stop the downward slide, recession looms over both sides of the Atlantic like a dark cloud.

NPR: European Rescue Plan Being Ironed Out In Brussels