把它想象成一个黑盒子。

Think of it as a black box.

youdao

在系统黑盒子内选择技术是一个体系结构决策。

Selecting technologies inside the system black box is an architecture decision.

youdao

但是，我能给你黑盒子内部清晰的图片。

But I can give you a clearer picture of what's inside the black box.

youdao

So you're implementing this black box, and if its purpose in life is to actually return a value, you have to tell the compiler what kind of value to expect, and this is going to have ripple effects.

你在实现这个黑盒子，如果它的目的是,返回一个值，你必须告诉编译器你期望的是什么类型的值，这个将是一个连锁反应。

哈佛公开课 - 计算机科学课程节选

So just to hammer home this point, for now, a function really is like a black box.

现在再三强调，让你们彻底了解这一点，一个函数就像是一个黑盒子。

哈佛公开课 - 计算机科学课程节选

The military staff carries the black box.

军事人员带着黑盒子。

普林斯顿公开课 - 国际座谈会课程节选