relay spring继电器: electric relay; relay弹簧: spring; mechanical spring继电器复位弹簧: relay retractile spring继电器回缩弹簧: relay retractile spring打结器弹簧: knotter spring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:继电器弹簧，即可在微信中查询翻译
