If it is necessary to borrow some money to fix the car, you should look for a friend who is an "easy touch".

VOA: special.2009.06.07

We're going to get a deep insight if it's a necessary truth about death that everyone dies alone.

如果这是对死亡来说必不可少的真理,那我们能得到一些深刻理解。

耶鲁公开课 - 死亡课程节选

Don't put in extra bells and whistles if it's not necessary.

不必要的话不要放进去,多余的铃声和口哨声。

麻省理工公开课 - 固态化学导论课程节选

It said the government could use force, if necessary,to keep states in the Union.

VOA: special.2009.07.16

If people are on the verge of dying, perhaps it is necessary to overlook that injustice, but I think it's important to keep in mind that we're still committing injustice by taking people's belongings or assets.

如果人们在死亡边缘挣扎，也许忽视这样的不公平是必要的，但我认为即使这样，我们依然要铭记,我们的行为不公正,这是在占有他人的财物或资产。

耶鲁公开课 - 公正课程节选

It says catheters should be used only if necessary.

VOA: special.2010.04.21

If that is what it takes to bring JAL back, he must convince employees that it is a necessary step for the company's future success.

VOA: standard.2010.02.01