n.阀( valve的名词复数 );真空管;（管乐器的）活栓;（心脏的）瓣膜;
例句:
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Transistors have many advantages over the old-fashioned vacuumtube valves.
与老式真空管相比,晶体管具有许多优点.
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合拢的英文：fold参考例句：Open them, shut them.摊开手，合拢手。Fold together(sth that opens out)合拢(打开着的东西)That oyster closed up its valves那个牡蛎把壳合拢起来。Some flowers shut up at night as if they were to sle
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