n. priority valve
priority是什麼意思：
n. 在先，居前；優先，重點；優先事項
Road building is a top priority.
築路是最優先考慮的事。 Maintaining stability is of top priority.
穩定壓倒一切。It was a matter of balancing priorities.
這是一個權衡輕重緩急的問題。get one's priorities right
正確地安排某人的'優先事項 Financial controls were given to priority.
他們把財務管理當成頭等大事。valve是什麼意思：
n. 閥門；瓣膜；真空管
v. 裝閥於；以活門調節
Valve Disadvantages: The valve is difficult to close and requires the operator to double close the valve.
閥門的缺點:閥門難以關閉，要求操作者二次關閉閥門。pilot valve governor
帶伺服電動機的調節器輔助調速器 The valve has jammed shut.
閥門給卡住了打不開。multiple leaf valve
多簧片閥 cooled anode valve
冷板屏極真空管
