4級肌
5感 (Five Senses)
sight (視覚, eyes)
hearing (聴覚, ears)
smell (嗅覚, nose)
taste (味覚, tongue)
touch (触覚, skin)。
skin の関連語ファミリー
skin care (スキンケア), sunscreen (日焼け止め), moisturizer (保湿剤), wrinkle (しわ), freckle (そばかす), scar (傷跡), complexion (肌色 / 肌質)。慣用句
by the skin of your teeth = 辛うじて、get under your skin = 気に触る、save your skin = 命を救う、beauty is only skin deep = 美しさは肌の表面だけ (内面が大事の意)。