back of a tooth◇齿背线 tooth back line齿: tooth背: body's back齿背角: wire rear angle齿背线: tooth back line齿背棱角: zahnrückenfase straight land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:齿背,即可在微信中查询翻译