| 单词 | valve |
| 释义 | valve n 1 mechanical device for controlling the flow of air, liquid or gas in one direction only 阀; 阀门; 活门 the inlet/outlet valves of a petrol or steam engine 汽油发动机或蒸汽机的进给[排放]阀 the valve of a bicycle tyre 自行车胎的气嘴 a safety, exhaust valve 安全阀、 排气阀. =>illus at App 1 见附录1插图, page xiii. Cf 参看 tap1 1. 2 structure in the heart or in a blood-vessel allowing the blood to flow in one direction only （心脏或血管的）瓣膜. 3 device in certain brass musical instruments, eg cornets, for changing the pitch by changing the length of the column of air （管乐器的）活塞. =>illus at App 1 见附录1插图, page x. 4 (biology 生) each half of the hinged shell of oysters, mussels, etc 贝壳瓣. Cf 参看 bivalve. 5 = vacuum tube. |
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