该方法考虑了闭气环与衬套之间的摩擦力，比常规方法更接近实际；
Taking into account the friction force between obturator ring and liner, this approach is closer to the real condition than the conventional one.
该方法考虑了闭气环与衬套之间的摩擦力，比常规方法更接近实际；
Taking into account the friction force between obturator ring and liner, this approach is closer to the real condition than the conventional one.
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