Ossein
n. 骨胶原\\n[化] 骨胶原; 生胶质
🗣️ 情景例句
Attending school is compulsory in this country.
这国家衽的是义务教育。
Arthur must send that letter soon.
亚瑟，你必须立刻投递那封信。
I think she must be injured.
我想她一定受伤了。