preloaded spring预: in advance; beforehand紧: taut; tight弹簧: spring; mechanical spring还张紧弹簧: ringspannfeder ring-clamspring washer/ring-clamlock washer夹紧弹簧: verspannfeder spring lock washer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:预紧弹簧，即可在微信中查询翻译
