硝基置换

例句：

1. 1. The engineer replaced the old pistons with new ones.
   工程师用新的活塞代替了旧的。
2. 2. The team decided to replace the worn-out equipment with more modern models.
   团队决定用更现代的设备替换掉磨损的设备。
3. 3. The scientist conducted a study on how to replace nitrate with other nitrogen compounds in soil.
   科学家进行了一项研究，探讨如何用其他氮化合物替代土壤中的硝酸盐。