In natural environment, industrial production and transportation, particle of dust often present as the state of free falling or suspension.
在自然环境、工业生产及运输中，微粒粉尘往往呈现自由下降或者悬浮状态。
In natural environment, industrial production and transportation, particle of dust often present as the state of free falling or suspension.
在自然环境、工业生产及运输中，微粒粉尘往往呈现自由下降或者悬浮状态。
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