dorsal root dilator背: body's back根: root扩张: expand; enlarge; spread器: implement; utensil; ware扩张器: anal dilator; diffuser; dilater; eurynter; expander; extender; extensor; retractor; speculum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:背根扩张器，即可在微信中查询翻译
