The landing collar comprises housing, ball seat and latch.
由外壳、锁紧座和球座等组成。
The internal components of the landing collar are generally fabricated from plastics, cement and other drillable materials.
坐放箍的内部部件一般由塑料、水泥和其它可钻材料制成。
A diaphragm in the plug body ruptures to allow the cement slurry to pass through after the plug reaches the landing collar.
在塞体中的隔膜破裂，以便使水泥浆能在底塞到达止塞箍以后通过。
The top plug has a solid body that provides positive indication of contact with the landing collar and bottom plug through an increase in pump pressure.
顶塞具有一个实心的塞体，根据泵压的增加它能可靠地显示与止塞箍和底塞的接触。
Sellars kept her white-collar job, recently landing a pay raise, while Mr. Sinclair was laid off from his forklift driving job last year and only just found a new one -- at a 46% lower salary.
塞拉斯保住了她的白领工作，最近还加了薪，而辛克莱尔去年却因裁员失去了他铲车驾驶员的工作，近日才刚刚找到新工作，可工资却低了46%。
Sellars kept her white-collar job, recently landing a pay raise, while Mr. Sinclair was laid off from his forklift driving job last year and only just found a new one -- at a 46% lower salary.
塞拉斯保住了她的白领工作，最近还加了薪，而辛克莱尔去年却因裁员失去了他铲车驾驶员的工作，近日才刚刚找到新工作，可工资却低了46%。
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