活塞
pistons — plural of piston
（铜管乐器的）活塞阀键；柱塞；往复运动部件；皮斯顿（美国新古典主义作曲家，1894—1976）；一种实心圆盘或圆柱体,紧密配合在空心圆柱内,在压力下运动(如发动机中)或排挤流体(如泵中)。；美国新古典主义作曲家(1894-1976)
a solid disk or cylinder that fits inside a hollow cylinder and moves under pressure, as in an engine or pump
一种实心圆盘或圆柱体,紧密配合在空心圆柱内,在压力下运动(如发动机中)或排挤流体(如泵中)。
A solid disk or cylinder that fits inside a hollow cylinder, and moves under pressure (as in an engine) or displaces fluid (as in a pump)
美国新古典主义作曲家(1894-1976)
United States neoclassical composer (1894-1976)
某些铜管乐器中用于改变音高的阀装置。
A valve device in some brass instruments for changing the pitch
具有柱塞或推力运动的机械装置
mechanical device that has a plunging or thrusting motion
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