Typically the vacuum is generated by a water aspirator or a membrane pump. 真空由水抽子或隔膜泵產(chǎn)生。
The membrane is impermeable to blood cells and large molecules such as proteins, but small ones can get through it. 血液分子和一些大分子例如，蛋白質(zhì)，是無(wú)法滲透隔膜的，而小分子仍然可以通過(guò)。
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