kerat

例句：

1. 1. The skin on her faceis very smooth and healthy.
   她脸上的皮肤非常光滑健康。
2. 2. The doctor removed the deadskin from his wound.
   医生从他的伤口上移除了死皮。
3. 3. Thescientist studied the chemical compositionof human skin.
   科学家研究了人类皮肤的化学成分。