Keratin
n. 角蛋白\\n[化] 角蛋白
🗣️ 情景例句
if that's what you mean.
是这个意思吧。
I don't allow my children to play with toy guns.
我不让自己的孩子玩玩具枪。
A lot of cars entered for this race last year and there was a great deal of excitement just before it began.
去年有很多汽车参加了这项比赛。比赛开始之前，人们异常激动。