主阀的英文：
king valve
main valve
master valve
primary valve
n. 君主；国王；最有势力者；大王；王棋
v. 统治；做国王
- King of the castle
山大王 - The lion may be king of the jungle, but in the rivers, the hippopotamus is king.
如果狮子是陆上的万兽之王，那么河马就是河中的霸主。 - Their attempt to restore the king failed.
他们想使国王复位的企图失败了。
n. 阀门；瓣膜；真空管
v. 装阀于；以活门调节
- Valve Disadvantages: The valve is difficult to close and requires the operator to double close the valve.
阀门的缺点:阀门难以关闭，要求操作者二次关闭阀门。 - pilot valve governor
带伺服电动机的调节器辅助调速器 - The valve has jammed shut.
阀门给卡住了打不开。
adj. 主要的；全力的，尽力的
n. 总管道，总线；干线，电力网，电源；体力
- by (main) force
用蛮力, 全靠气力; 以最大的力气 - main gate lodge
大闸区；大闸门房；大闸传达室 - This is the main road into town.
这是进城的主要道路。