Use bellows mechanical seal the cost is too high, but the service life is longer than the first two, maintain or change relatively trouble.

使用波纹管机械密封的的成本太高，可是使用寿命长于前两种，维护或者改换时斗劲麻烦。

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This paper shows the construction of hydrodynamic oil seal SR. and discusses its properties and service life through test.

本文介绍“SR”流体动力油封的结构，通过试验更进一步论述“SR”流体动力油封的密封性能和使用寿命。

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The research on deformation of rubber piston of slush pump provides a basis of improving the seal properties and increasing the service life of the piston.

泥浆泵橡胶活塞变形的研究，可为改进活塞的密封和寿命性能提供依据。

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The French Open champion was held up briefly when he squandered a 0-40 lead and three match points at 5-3 but raced through his final service game to seal victory in just over two hours.

BBC: Nadal win sets up Federer final

Nadal was relatively untroubled in seeing off Czech Tomas Berdych 6-4 7-5 in one hour and 41 minutes, with a pair of service breaks enough to seal the win.

CNN: Federer and Murray to clash in Cincinnati

He has put himself back in the race by winning Georgia: he gets secret service protection from today, the US Government's seal of seriousness on a candidate.

BBC: Romney fails to seal the deal on Super Tuesday