You need to demonstrate that you have done this kind of work before.

你需要证明你有做这方面的工作前一种。

youdao

For today, though, I wanted to demonstrate that you don't need fancy web calculators or personal-finance programs to answer certain questions.

不过，今天我只想告诉你，你不需要找那种网络计算器或者个人理财项目来回答某些特定的问题。

youdao

You and your team need to demonstrate over the course of a few weeks that you can make things a bit better.

你和你的团队需要展示的是，通过一两个星期的学习，你们能让事情更好一点。

youdao

Therefore you know you can do the job, but you need to demonstrate that you're capable of handling a promotion.

CNN: Know this before your performance review