Are you sure you're telling the truth ?

你说的真是实话吗？

《牛津词典》

While I have doubts about the practical application of this theory in a business setting I'm not sure about telling a room full of workers they suck!

我虽然对这个理论在商业环境中的实际运用抱有疑问(我不能肯定我会对满满一屋子的员工讲他们很差会是什么情形！)

youdao

If someone else insists on telling you something, make sure it stops with you.

如果其他同事执意跟你讲，确保自己不会去掺和此事。

youdao

Make sure you are telling them about benefits, what the thing will DO for them, not the HOW it works.

FORBES: Presenting You and Your Business: Opportunities Not To Be Missed (Especially In A Wacky Economy)

So even if their initial trials do work, there will be no way of telling for sure which group of cells is responsible.

FORBES: Cell makers

To make sure his volunteers were telling the truth, Dr Ehrsson surprised them after two minutes of tapping by swinging a hammer towards the camera.

ECONOMIST: Consciousness