The company agreed to keep up high levels of output in order to compensate for supplies lost

　　這家公司同意保持高產量以彌補供貨丟失帶來的缺口。

　　I still keep up my acquaintance with him.

　　我仍然和他保持朋友關系。

　　I can't keep up with all the changes.

　　我并非所有的`變化都能跟得上。

　　It pays to keep up to date with your work.

　　工作能跟上時代是有利的。

　　It is difficult to keep up with the rapid pace of change.

　　跟上迅速的變化是很困難的。

　　Slow down ─ I can't keep up!

　　慢點——我跟不上了！

　　When she lost all her money, she was determined to keep up appearances.

　　她把錢全虧光時，決意佯裝若無其事。