gingival chamfer龈: gum凹: low-lying area; depression线: thread; string; wire凹线: chamfer; concave line; concave upward; groove凹线沟: pit-line groove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:龈凹线,即可在微信中查询翻译