这是一个由Emazekraker提供的漂亮的线框工具，包含每个元素的明、暗两个版本。

Here's a stylish wireframe kit from Emazekraker, which includes both light and dark versions of each element.

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四年的辛勤工作和提炼了大量的沥青铀矿，玛丽和她的丈夫终于看到了发出暗蓝色微光的新元素——镭。

After four years' hard work and refinement of tons of pitchblende, Marie and her husband at last saw the dim blue light of the new element-radium.

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如果研究人员能够识别暗墙上含有的化学元素，那么就能知道墙壁上涂了哪些颜色，从而得知暗墙的设计图案。

If researchers could tell which elements were on the hidden wall, they would know which colors were painted there and could make out the design.

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