为了测试材料的自洁性能，郭教授和他的团队将吸尘器里取出的普通灰尘洒在加工过的材料表面上。
To test this self-cleaning property, Guo and his team took ordinary dust from a vacuum cleaner and dumped it onto the treated surface.
我们是你的朋友马可、郭文洁。
郭采洁不仅给我们带来了美妙的歌声，还给了我们梦想的力量。
Amber brings us wonderful songs, moreover, she gives us the power of dream.
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