reducer couplingreducing jointreducing piece缩: contract; shrink径: footpath; path; track接头: connect; join; joint缩径接管: reducer coupling缩径管接头: reducer coupling; reducing coupling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:缩径接头，即可在微信中查询翻译
