rolling bridge滚轮: contact roller; trolley whee ...活动桥: movable bridge; traversing b ...用滚轮的活动桥: roller bridge; rolling drawbridge活动桥: removable bridge; traversing bridge叶轮活动器: impeller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:滚轮活动桥。，即可在微信中查询翻译
