Every pack of powder is back-filled with inert gas to prevent further oxidation during storage.
惰性气体的运用防止了在贮藏时每一包焊锡粉的进一步氧化。
2
He came back to the city, which was filled with happiness, to seek the footprints of him and her.
他回到了那座城市，那座充满了幸福的城市，去寻找着他和她的足迹。
3
He drank a lot, and then he filled his bottle so that he could bring some back to his village and gave it to his teacher who had taught him in middle school.