1. He checked the flow of water by shutting off the main valve. 
   通过关上主阀他中断了水流。
2. a force applied by a piston to a small area is transmitted through water to another piston having a large area. 
   作用在小面积活塞上的力通过水转化成作用在大面积活塞上的力。
3. the main house on a ranch or large estate. 
   农场上的一所大宅院或是大宗的不动产。
4. reciprocating piston internal combustion engine 
   往复活塞式内燃机
5. Pack a valve stem. 
   扎好活门塞

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