... backspring反向弹簧，回动弹簧 backstreaming托底单向流 backswept1后掠2后掠角 ...
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... backstop 撤退退却定程挡块 backstreaming 逆流 backup roll 支承辊 ...
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... backstoptongs后挡钳 backstreaming回流 backwall后墙 ...
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ultralow backstreaming 超低漏泄
oil backstreaming 油汽返流
gas backstreaming 气体回流
oil vapor backstreaming 油烟回流
reduce backstreaming 减小回流
reflux , counterflow
It reveals the essence of the backstreaming of diffusion pump and provides a theoretical basis for reducing the backstreaming of diffusion pump.
揭示了扩散泵返流的实质，为减少扩散泵返流提供了理论依据。
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