Ceratine
角質
??? 情景例句
He's going to be in New York tomorrow
明天， 他要來紐約
It's faster to go by plane than by boat.
和坐船比，坐飛機是更快的。
I want to improve, but I don't know how.
我想提高它，但又不知道怎么樣才能提高。