To be good at it, you need to understand something about local circumstances and aquatic biology.

要想精于此道，你必须了解当地环境及一些水生动物相关知识。

youdao

Something you need to understand.

有件事你需要明白。

youdao

These are brands aligned with a purpose. It's not something you need an MBA to understand-more a promise, or a mantra of virtue.

这些品牌都会带着一种精神目标：一种承诺，或者一个美德的咒语，这些东西你不用非要有MBA学位才能理解。

youdao

They say that you do not need to be extremely intelligent to understand something.

VOA: special.2010.06.27

Something that you need other people to understand needs to happen.

你需要其他人明白这些事必定会发生。

It's important 课堂 - SpeakingMax英语口语达人

To understand why you need to understand something about the economics of the whole newsprint (ie, newspapers and magazines) game.

FORBES: The Wall Street Journal Europe's Circulation Scandal

You need people who understand markets, patent landscapes and finance and how to make something actually work once you've had the idea.

BBC: Protecting that great idea with a patent