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Rotation of one gear , the driver causes the second , or follower gear, to turn . the driving shaft is usually connected to the upper gear of the pump . 第一個齒輪即主動輪的廻轉引起第二個齒輪即從動輪的廻轉。敺動軸通常連接到泵上麪的齒輪上。 jx76.com