chalk dust造句

1、to beat chalk dust from erasers
弹掉黑板擦上的粉笔灰

2、The teacher beat chalk dust from erasers.
老师掸掉黑板擦上的粉笔灰。

3、Yes, the classroom is always a comfortable working condition except some chalk dust still.
是的,课室虽然还有粉笔尘,但仍然是很舒适工作环境

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