它本质上是一个横向卷。

And it is essentially, a horizontal volume.

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根据横向卷曲短螺卷屑形成过程中切屑动力学及其折断判据理论，得出了极限背吃刀量的理论预报公式；

Based on the theory of chip dynamics and it's breaking foundation in the formation process of side-curl short-spiral chip, the critical depth-of-cut is formulated.

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在这种情景发生之前，云卷往往可以形成与实际横向运动云的循环空气。

When this happens along a front, a roll cloud can form, often with air actually circulating along the horizontal axis of the cloud.

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