Nitronate
氮酸酯
🗣️ 情景例句
Gemma, sit. Gemma
Gemma,坐,Gemma,
It's hard to say.
很难说。
The development of such a telescope will be one of the great astronomical projects of the twenty-first century.
而开发这样一台望远镜将会是21世纪天文学的一个重要的研究课题。