首先，你得知道有两个版本的双推。

First off, you need to know that there are two versions of DoubleTwist.

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把重力添加到你的双推中，添加重力。

Feed your double push with gravity, feed gravity.

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提出并解析了等空时双平推流循环流动的数学模型。

Mathematical model of recycle tubular flow with equal space time is pro-posed in this paper.

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切纸机的双齿条推纸机构。

A dual rack paper-pushing device on paper cutting machine.

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切纸机的双齿条推纸机构。

A dual rack paper-pushing device on paper cutting machine.

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