Phosphonitrogen
磷氮肥
🗣️ 情景例句
Food is necessary to maintain life.
食物是维持生命所必须的。
Don't worry, leave everything to me.
你不必担心，一切还有我哪！
why have we had no visitors from outer space yet?
那么我们为什么还未见到外层空间来访的客人呢？