Polycladin
波来克黄素
🗣️ 情景例句
Oh, what are you doing tomorrow?
噢， 明天你打算做什么？
I feel terrible about it.
太对不起了。
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。