n. priority valve
priority是什么意思：
n. 在先，居前；优先，重点；优先事项
Road building is a top priority.
筑路是最优先考虑的事。 Maintaining stability is of top priority.
稳定压倒一切。It was a matter of balancing priorities.
这是一个权衡轻重缓急的问题。get one's priorities right
正确地安排某人的'优先事项 Financial controls were given to priority.
他们把财务管理当成头等大事。valve是什么意思：
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。multiple leaf valve
多簧片阀 cooled anode valve
冷板屏极真空管
学识谷
