A plunger (24) having an elongate body portion and a stopper (54) slidably positioned in fluid-tight engagement with the inside surface of the barrel is provided.
配置具有拉长主体部分和止动件（54） 的柱塞（24），所述止动件以与针筒内表面液密啮合的方式滑动定位。
The magnetic fluid seals' rules at large gap and high speed conditions were studied and the theoretical explaining was given. A method to improve the tight capacity was given.
通过实验研究了大间隙、高转速条件下磁性流体密封的规律，并对其进行了理论分析。另外还给出了改进大间隙条件下，提高密封性能的措施。
The chimney shows the mineral zonation around a tight conduit associated with fluid, which is quite similar to those formed by modern black smoker at sea floor.
它们保留了成矿流体运移的通道构造，围绕通道构造还显示良好的矿物分带现象，完全可以与现代海底黑烟囱对比。
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