Mitragynine
帽柱碱
🗣️ 情景例句
The rich few nations of this world take up the vast majority of the wealth and resources.
少数几个富裕的国家占有了大多数的财富和资源。
Do you really want to know what I think?
你确实想要知道我认为什么吗？
Dear Robert,
亲爱的Robert，