Cynoctonine
北乌头碱, 西妥宁(一种生物碱)
🗣️ 情景例句
He said I should call him.
他说我可以打电话给他。
If you agree to carry the calf, they'll make you carry the cow.
得寸进尺。
Who was second? Who was third?
谁是第二？谁是第三？