可以进行测试的整个范围通常太大，难以在给定的时间内完成测试工作，当多个特性组合在一起时测试的范围将变得更大，其排列组合呈指数上升。

The entire universe of things that could be tested is typically too large to be covered within a given schedule, even more when multiple features are combined and the permutation grows exponentially.

youdao

在实物保险箱及号码锁的安全措施之下，盗贼将需要近乎无限的耐心以及近乎无限的预期寿命，才能将各种排列组合的可能性从头到尾尝试一遍。

With a physical safe and a combination lock, the thieves would need nearly infinite patience and a nearly infinite life expectancy to work their way through the possibilities.

youdao

法律的体系结构问题是一个按一定逻辑联系将法律规范加以排列组合的问题。

The problem of the system and structure of law is, in effect, a legal totality put together according to the legal norms in a logic order.

youdao

This is a game where you get a little plastic device, it's got 15 plastic numbers on it and one hole in this little plastic board and you can move those numbers up, down, left to right, and the goal is to take what's a random assortment of tiles and arrange them in numeric order and that's one of these little things you can play sort of absentmindedly.

在这个游戏中，你会拿到一个可塑的装置，上面有15个数字和一个孔,你可以将数字上下移动，左右移动，目标就是,拿到一个随机的组合后,将其按数字顺序排列,这个你可以随便玩玩。

哈佛公开课 - 计算机科学课程节选