Oil leakage often occurs in reducer due to its blowhole of ventilator jams for a short time while reducer operating under excessive dust condition.

高粉尘环境下工作的减速器，经常因其上的通气器通气孔堵塞（短时间内）而引起漏油现象。

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If your old house has lead paint in good condition, cover it with fresh paint rather than removing it, which releases lead dust into the air.

如果你的房子曾经刷过含铅的油漆，并且漆层还比较好，最好的方法是用新的不含铅的油漆覆盖旧的漆层，而不是去除老的含铅的漆层，因为这样做，铅尘反而排放到空气当中了。

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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，但仍然是很舒适的工作环境。

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