求翻译：齿轮泵的工作原理如图3-3所示。齿轮泵主要由一对齿轮、外壳、泵盖、轴及轴承和密封盖板等组成。在泵体内有一对外啮合齿轮，齿轮两端面靠盖板密封，这样泵体，盖板和齿轮的各齿槽就形成多个密封腔，轮齿啮合线又将左右两密封腔隔开而形成吸、压油腔。当齿轮按图示方向旋转时，吸油腔（右侧）内的轮齿不断脱开啮合，使其密封容积不断增大而形成一定真空，在大气压力作用下从油箱吸进油液，随着齿轮的旋转，齿槽内的油液被带到压油腔（左侧）申压油腔内的轮齿不断进人啮合，使其密封容积不断减小，油液被压出。随着齿轮不停地旋转，齿轮泵就不断地吸油和排油。是什么意思？

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Gear pump works such as Figure 3-3. Gear pump mainly consists of a gear pump cover, housings, bearings, shaft and seal and cover. The pump body has a external gears, spur gears on the cover seal, so that the pump body, cover plate and the gears on the tooth forming multiple seal engages a tooth cavi

Gear pump work as shown in Figure 3-3. Gear pump consists of a pair of gears, casing, pump cover, shafts and bearings and seals the cover and so on. There is a external meshing gear pump body, ends of the g