Keratan
角质素
🗣️ 情景例句
He devoted his life to promoting world peace.
他一生致力于促进世界和平。
The bird loves her nest.
鸟爱自己的窝。
What is the most popular food in the USA? I think it is fried chicken.
在美国什么食品最受欢迎呢？我认为是炸鸡。