Thpc
[建] 氯化四(羟甲基)磷
🗣️ 情景例句
When he came to the States five years ago, he had only forty dollars in his pocket.
五年前他来美国时，口袋里只有40美元。
What is the gate number?
登机门是几号？
We should save unnecessary expenses.
我们应节省不必要的开支。