According to the advertisement, this new razor will give you an extra smooth shave. 据广告讲,这种新的刮胡刀可使你修面分外光洁。
Lips are not skin as such but mucous membrane so they do not produce oil and lack protective melanin pigment-needing extra care to keep them smooth. 嘴唇上的粘膜组织,不像皮肤那样产生油脂,且缺乏黑色素的保护&需要额外照顾,保持润滑。