她了解她在说什么，因为她在该领域有丰富的经验。

She ___knows ___what she is ___talking ___about because she has extensive experience in the field.

我信任他的判断；在金融方面，他显然了解他在说什么。

I trust his judgment; he clearly ___knows ___what he is ___talking ___about when it comes to finance.

作为一位经验丰富的工程师，你在技术问题上了解你在说什么。

As a seasoned engineer, you ___know ___what ___you ___are ___talking ___about regarding technical issues.