We will contact you again if the need arises.

如果有必要，我们会再次和你联系。

《牛津词典》

These beavers do know how to build dams, and do so if the need arises, as may occur if they are forced to relocate after felling and consuming all nearby trees.

这些海狸知道如何建造水坝，而且在有需要的时候就会这么做，比如当它们在砍伐和消耗了附近所有的树木后被迫迁移的时候。

youdao

If the opportunity arises, I'd love to go abroad for further study.

如果有机会，我想出国深造。

youdao

The court has urged all countries, including those like Eritrea that have not signed up to the ICC's Rome Statute, to arrest President Bashir if the opportunity arises.

VOA: standard.2009.03.23

The problem only arises if you have an int divided by an int.

这个问题只会发生在,当你用一个整型数除以一个整型数的时候。

哈佛公开课 - 计算机科学课程节选

You click on it, it turns the entire player into a spreadsheet. It does give you a chance to shut down the player pretty quickly if the need arises."

VOA: standard.2009.03.25

If litigation arises, translating the contract into English will be necessary.

FORBES: Seven Dos And Don'ts For Chinese Investors In The U.S.

"If information arises that paints a different picture from the one that we have heard then obviously I know my responsibilities toward the ministerial code, toward how ministers behave, and I would act, " he said.

WSJ: Cameron Denies News Corp. Collaboration

Yet controversy has long swirled around habeas corpus on the question of whether it is aimed at assuring only that certain procedures be followed, or whether a case can be revisited, years or even decades later, if evidence arises that a convict turns out to be demonstrably innocent.

FORBES: Jeffrey MacDonald, Innocence, and the Future of Habeas Corpus