Keratan
角质素
🗣️ 情景例句
Mr. Lu, everything is OK. Your booking is from today through Wendnsday. Single room.
陆先生，没问题的。您从今天订到星期三，单人房。
The offer isn't subject to prior sale.
本报盘以货物未售出为条件。
I had not laughed since I became deaf.
我耳聋后就从来没有笑过。