Arsonation
引入胂羧基
🗣️ 情景例句
You've been working late
你一直工作到很晚
I am very much thrilled to see this luxurious office.
看到这样一个高层次的分支机构我感到很激动。
Although we can't see these atoms, they really do exist.
虽然我们看不见原子，但它们的确存在。