These seals consist of two flat faces, one extremely hard, the other softer, in direct contact except for a thin film of the oil being pumped.
这些密封有两个平面,一个很硬、另一个较软,两平面间除一层被泵送的油外,直接接触。
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Photobioreactors complicated systems of transparent piping through which alga-rich water is pumped overcome those problems, but they cost a lot and are hard to keep clean.
ECONOMIST: Biofuels are back. This time they might even work
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