Pyrazine
吡嗪, 对二氮杂苯, 胡椒嗪
🗣️ 情景例句
Are the bathrooms on this train clean?
火车上的卫生间干净吗？
I'm going to show him how to speak Spanish.
我正要指点他如何讲西班牙语。
It was upon this principle that the first instruments were made,
据这一原理，制造出了最初的地震仪器，