Collogen
[医] 胶原
🗣️ 情景例句
Permanently?
一直住下去？
So far I have been learning about China.
到止前我止，我一直都在研究中国的事情。
Knowledge began to increase as soon as the thoughts of one individual could be communicated to another by means of speech.
人一旦能用语言同别人交流思想，知识的积累便开始了。