I understand what you're saying.

我明白你说的意思。

Not at all.

绝不是

It's important for you to keep a cool head at this moment.

这时候保持头脑冷静是很重要的。

The weather's been very hot lately.

最近天气总是很热。

That's irrelevant.

那不相干。

You know it isn't true.

你心里明白那不是真的。