Toxogenin
过敏毒原素
🗣️ 情景例句
However, through my experience in business at home and abroad.
但从事国内外的商业的经历中。
What is the highest mountain in this country?
这个国家最高的山是什么？
I have just heard from my sister, Mary.
我刚收到我妹妹玛丽的一封信。