Don't prattle about your theory. You must practise it and prove it.

不要空谈你的理论，你必须去实践它并检验它。

youdao

But when someone does call, look at it as a great opportunity to create fanatically devoted customer, one who will prattle on and on about what a great job you did.

不过当某人真的打电话来，要把它视为一个建立狂热忠诚客户的绝佳机会，让这个客户到处宣传你们做得有多么好。

youdao

Rather than prattle on about the coming apocalypse, they could work to replace treeless, dense slums with shaded low-lying clean houses that are easier to heat or cool.

FORBES: The Green Movement's People Problem

As for these United States of America, well, you can prattle on about Michael Phelps or Bruce Jenner or Muhammad Ali or any other famed Olympian we have produced, but keep in mind this: Our wrestlers have won 50 golds.

CNN: Don't drop wrestling from Olympics