油膜沿内筒壁向下流动，形成油幕，空气在穿过时受到油浴，使部分尘粒被分离。

Oil film along the inside of the inner flow down, form in the tabernacle of the congregation, air through the oil when oil bath, make part by mote is separated.

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地下确实存在油。气的幕式运移和幕式充注，但幕式是一个有时间尺度的概念。

Episodic migration and episodic injection do take place under the ground, but the episode is one concept measured by time.

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