A new study found a simple and powerful way to control particles and form crystals: illuminating them. The research provides a simple and reversible method for forming crystals that can be used to develop a new generation of adaptable materials.

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（十）货物包装不当或者标志欠缺、不清；

Фото: Nathan Howard / Reuters

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如果我们把当年的战役地图拿出来，覆盖在今天的地图上，会感到脊背发凉：