roller track滚轮: contact roller; trolley whee ...轨: rail; track轮轨: wheeltrack滚轮: contact roller; trolley wheel (电车接电轮)导轮轨: idler track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:滚轮轨，即可在微信中查询翻译
