This is the crux of the matter.

这就是问题的关键所在。

《新英汉大辞典》

In a large, hierarchical organisation, this is the real crux of the matter.

在一个大型的、等级森严的组织中，“加强控制”是问题的关键。

youdao

This brings me to the crux of the matter - is it important to make money or is it important to follow your dream?

这件事让我明白事情的关键在于——挣钱重要，还是追寻自己的梦想重要？

youdao

The interconnectedness, however, is unchanged, and this is the very crux of the matter.

FORBES: Financial Reform? Sure. But The Systemic Six are Here to Stay

And this, it seems, is the crux of the matter.

BBC: Surgery generic