这让我们不禁要问：什么是英雄？

This leads us to ask: what is a hero?

youdao

因此我们不禁要问：发生了什么事？

So we have to ask this question: What's happened?

youdao

当写出这样一个方程，我们不禁要问。

So, if we write something like this, it implies this kind of equation.

youdao

"Who are you, Socrates," we are inclined to ask, "? "to tell us what we can read here and listen to?"

我们不禁要问：，“你是谁，苏格拉底，究竟想告诉我们该读与该听什么“

耶鲁公开课 - 政治哲学导论课程节选

So, if we write something like this, it implies this kind of equation.

当写出这样一个方程，我们不禁要问。

麻省理工公开课 - 热力学与动力学课程节选

So we have to ask this question: What's happened?

因此我们不禁要问：发生了什么事？

耶鲁公开课 - 弥尔顿课程节选