piston valve ring活塞: plunger; stop; bibb cock; bi ...阀: established house or power g ...填密: densification; packing环: ring; hoop阀填密环: valve packing ring下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:活塞阀填密环，即可在微信中查询翻译
