Nitropolymer
硝基聚合物
🗣️ 情景例句
He's a lucky boy.
他是个幸运的孩子。
I'm afraid all my efforts were in vain.
我担心我的努力全白费了。
So far as I know you shouldn't have any problems there.
就我所知，你在那里不会有什么问题的。