Lactotoxin
乳毒素
🗣️ 情景例句
No sweat.
小事儿。
You must not pledge your own health.
切不可把健康作孤注一掷。
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。