You need to know some useful information.

你需要知道一些有用的信息。

youdao

Sometimes you need to be vague because you don't know some information or because the information is not important.

有时候你需要含糊表达，因为你不知道情况，或那些情况不重要。

youdao

"Do you really need to know who your doctor is, or is it more important to know some processes that will help you get at the information you need?"

或者了解其中的过程并帮助你获得你所需要的信息真的那么重要？

youdao

Some of the most important information you'll ever need to know, how long your Dad will survive if he gets cancer, your chances of a good life if you have a stroke, all this is out of your hands.

BBC: Cameron's data speech in full