back angle quadrant靠背: back角: role; part; character量角器: protractor; horn protractor; ...背角量角器: back angle quadrant膝部角量角器: knee angle quadrant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:靠背角量角器，即可在微信中查询翻译
