Internal gear pump is the small gear wheel, the big gear for driven wheel, in work big gear with small gear cocurrent rotation.
内啮合齿轮泵中的小齿轮是主动轮，大齿轮为从动轮，在工作时大齿轮随小齿轮同向旋转。
Gear pump with the direction of rotation into and out in line with the oil mouth.
齿轮泵的旋转方向要与进、出油口相符。
The rotation gear is playing like an old-fashioned movie, with a red brick wall with the past breath.
齿轮的转动就像是在播放一部老式的电影，与红砖砌成的石墙一起怀念着过去的气息。
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