1. 释义：to defeat an opponent especially in a long or difficult contest,often used figuratively

2. 理解：prevail 有获胜、（态度、风俗）流行的意思，这里关注“获胜”这个用法，可与win,triumph替换。经常有比喻的用法，主语一般是一些抽象名词。

prevail+over/prevail against=prevail over

3. 应用

1）翻译：尽管困难重重，真爱总是可以战胜一切。

No matter how difficult it would be,true love will always prevail.

参考翻译：Despite great odds,true love always prevails.

2) 造句

We always believe that common sense would prevail, but sometimes there are  exceptions.(我们总是相信常识会获胜，但世事常有意外。）