mask

n.   面具; 假面具; 用作掩饰的事物; 护肤膜; sexy mask  face mask vt.  掩饰; 戴面具; 用面具遮住，掩盖，掩饰; vi.  戴面具; 隐瞒，掩饰; The gunman, whose mask had slipped, fled. 面罩掉落的持枪歹徒逃之夭夭了。