keep on 和 keep up有什么不同之处吗？意义？用法

keep up:

保持,继续,维持

例句与用法:
1. The enemy kept up their bombardment day and night.
敌军一直日夜不停地狂轰滥炸。
2. The high cost of raw materials is keeping prices up.
原料费用昂贵使得产品价格居高不下。
3. The house is becoming too expensive for them to keep up.
他们的房子维修费用贵得越来越修不起了。
4. I can't keep up with all the changes in computer technology.
计算机技术的各种改进有些我已跟不上了.
5. Workers' incomes are not keeping up with inflation.
工人的收入赶不上通货膨胀.
6. Let's hope the sunny weather keeps up for Saturday's tennis match.
但愿星期六网球比赛时还是这样的好天气.
7. Slow down I can't keep up (with you)!
慢点, 我跟不上（你）了!
8. You're all doing a splendid job; keep up the good work!
你们干得都很出色, 要坚持下去!

keep on:

vt. 继续进行(接连,反复,继续)

例句与用法:
1. Keep on past the church; the stadium is about half a mile further on.
一直向前走过了教堂，约莫半英里就是体育场。
2. I will mend the lamp just don't keep on