update和upgrade的區別：
1、update 強調時間上的更新。
2、upgrade 強調技術/等級上的更新。
update的用法
1、He was back in the office, updating the work schedule on the computer?
他已回到辦公室，正在電腦上更新工作日程。
2、She had heard the news-flash on a TV channel's news update.?
她在壹家電視臺的新聞快訊中聽到了這則簡明新聞。
3、We'll update you on the day's top news stories?
我們將為您提供當天的重要新聞。
4、Airlines would prefer to update rather than retrain crews.?
航空公司更願意換新員工而不是對舊員工重新進行培訓。
5、I would just update them on any news we might have.?
我們壹有新消息我就會告訴他們。
upgrade的用法
1、Helicopters have been upgraded and modernized?
直升機已經更新換代，裝配了現代化設備。
2、He was upgraded to security guard.?
他被擢升為保安。
3、You can upgrade from self-catering accommodation to a hotel.?
您可以將自理膳食旅店升級為酒店。
4、Medical facilities are being reorganized and upgraded.?
正在對醫療設施進行重組和升級。
5、They upgrade, install, and virtualize servers and applications.?
他們升級、安裝和虛擬化服務器與應用程序。