top half back off safety joint上: upper; up; upward半: half体: body; part of the body卸: remove cargo or freight; unl ...扣: button up; buckle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:上半体卸扣安全接头,即可在微信中查询翻译