短語詞組短語belt tightener wheel 皮帶張緊輪triangular belt -wheel 三角帶輪synchronization belt -wheel drive 同步帶傳動belt drive wheel 傳動帶敺動輪belt pulley wheel 皮帶輪belt driving wheel system 帶輪系large sync belt -wheel 大同步帶輪abrasive belt wheel 砂帶輪 返回 belt wheel