Dinitrate
二硝酸盐
🗣️ 情景例句
I have been a secretary in an insurance company.
我一直在一家保险公司担任秘书工作。
No man knows when he shall die, although he knows he must die.
纵然知其难免一死，人却难料何时身亡。
when a significant number of people are living permanently in space.
如果有相当数量的人永久性地住在太空，