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After the horseplay by the wicked students, the classroom floor was strewn with crumbled chalk dust.
那班顽皮学生闹著玩儿，捏碎不少粉笔，过后，教室地板上撒满了粉笔灰。
Now they're focusing on chalk, so we have chalk dust all over everything.
现在他们专注于粉笔，所以我们到处都是粉笔灰。
The amount of dust that you need to drop by a degree or two wouldn't result in chalk dust over everything.
您需要降低一两度的灰尘量不会导致粉笔灰尘覆盖所有东西。
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