听听她关于数字营销的建议——她真的对此很在行。

Listen to her advice on digital marketing — she really ___knows ___what she is ___talking ___about.

你可以相信他对市场的分析；他对此有真知灼见。

You can trust his analysis of the market; he ___knows ___what he 's ___talking ___about.

在你否定这个想法之前，先确保你对此有充分了解。

Before you dismiss the idea, make sure you ___know ___what ___you ___'re ___talking ___about.