noun 下载 🔗分享 活塞 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) Examples : "The car engine uses pistons to convert the fuel's energy into movement. " 汽车引擎使用活塞将燃料的能量转化为动能。 machine technical part device 与AI对话词汇游戏阅读练习
noun 下载 🔗分享 活塞，阀门。 A valve device in some brass instruments for changing the pitch Examples : "The trumpet player pressed the pistons to change the notes of the song. " 小号手按下活塞阀门来改变乐曲的音调。 music device technical 与AI对话词汇游戏阅读练习
