rear idler hub后: behind; back; rear空转轮: free pulley; free-rolling wh ...壳: shell; hard surface后空转轮: rear idler wheel转轮壳: runner housing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:后空转轮壳，即可在微信中查询翻译
