He hit the other boy again and again as his friends egged him on.

　　他在朋友的煽動下一次又一次地打了另一個男孩。

　　Its difficulties appear so great that, however hard we work, we fail again and again.

　　它的困難似乎如此之大,無論我們多么努力,我們一次又一次地失敗。

　　I've told you again and again not to do that.

　　我一再告訴過你別干那種事。

　　He would go over his work again and again until he felt he had it right

　　他會反復(fù)檢查自己的工作直到他認為正確為止。

　　The same changes took place again and again.

　　同樣的變化一再發(fā)生。