1. any valve that checks flow by the seating of a ball. 
   通过球座套阻止流量的阀。
2. directional correlation of nuclear radiation 
   核辐射的方向角关联
3. motor vehicle handling directional stability 
   汽车操纵稳定性
4. Pack a valve stem. 
   扎好活门塞
5. An automobile's directional lights. 
   汽车方向指示灯

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• 1. 座式换向阀
  seated valve pump (液压) 止回阀调节的泵...seating directional valve 座式换向阀...seating valve 座阀
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