Agnesite
碳铋矿
🗣️ 情景例句
It's common practice.
这是惯例。
Dad is welcoming uncle Bob.
老爸去迎接鲍勃叔叔。
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。