I won't tell them—not unless you say I can.

我绝不告诉他们—除非你允许。

《牛津词典》

Unless you say sorry to him, you won't be friends again.

除非你向他道歉，否则你们就不再是朋友了。

youdao

Nothing is an obstacle unless you say it is.

没有什么是障碍，除非你说是。

youdao

said Ransie. "Unless you're in such a hurry to get away that you don't want me to say it."

VOA: special.2009.11.14

Whenever you hear the term ionization energy, make sure you keep in mind that unless we say otherwise, we're talking about that first ionization energy.

但无论什么时候你听到电离能这个词，一定要记得，除非特别说明，我们都是在说第一电离能。

麻省理工公开课 - 化学原理课程节选

The incentive in Washington is such that it's virtually impossible to cut spending unless you can go to the voters " and say "We don't have the money."

政府的机制就是这样,削减财政开支，几乎不可能,除非你有勇气对选民说,“政府没钱了“

斯坦福公开课 - 经济学课程节选

As an innovation strategy it is hard to fathom unless you say a device is essential to the platform strategy.

FORBES: Who Has The Winning Innovation Model, Google, Apple, or Samsung?

For example, it turns out that if you set up a system with your employer where the employer automatically deducts some of your paycheck and puts it into your 401(k) account, unless you say you don't want it done, it turns out people save more just naturally.

WHITEHOUSE: The Economy and the American Family

When someone asks you for help, say yes unless it will harm you or your family.

FORBES: 25 Quick Tricks for Boosting Your Personal Brand