They are dangerous only if programmers are careless.

只有当程序员粗心大意时，它们才是危险的。

youdao

The lawyer is paid only if he wins.

律师只有打赢官司才会被付费。

《柯林斯英汉双解大词典》

Children are admitted only if accompanied by an adult.

儿童必须有成年人陪同方可入场。

《牛津词典》

It used to be that players in professional sports could change teams only if they were traded, sold or released.

VOA: special.2010.07.26

It's as if the commodity of the bride is deemed truly valuable only if it can be guaranteed pure and untouched.

这就好像新娘这件商品,只有在完全的纯净没有动过才是有真正价值的。

耶鲁公开课 - 弥尔顿课程节选

The "parable of the vineyard" assures us that God rewards us regardless of our hard work and investment, but only if we're called, only if God chooses us.

葡萄园的寓言“使我们确信,无论我们是否努力工作都会得到上帝的奖励，但除非上帝选择了我们。

耶鲁公开课 - 弥尔顿课程节选

Help with shopping, meal prep and cleaning is Medicare-covered only if you're receiving hospice care, too.

WSJ: The Experts: Financial Mistakes in Retirement

Investors are completely rational. they take risks only if they get paid for doing so.

FORBES: Taking the Plunge

We can beat them, but only if we can get to the starting line.

FORBES: A Challenge to America: Develop Fusion Power Within a Decade