She was skipping to keep up with him.

　　她連蹦帶跳地走著，好跟上他的步伐。

　　I can't keep up with all the changes.

　　我并非所有的變化都能跟得上。

　　We'll do our best to catch up with the advanced world levels.

　　我們將努力趕上世界先進(jìn)水平。

　　There's still time to catch up with them.

　　還有時(shí)間追上他們。

　　You won't be fed up with rice.

　　米飯每天吃都不會膩。

　　But you'll be fed up with the same old dish.

　　但是小菜每天都一樣，便會膩。