He has got to hear it from the horse's mouth. Then he can make a judgment as to whether his policy is correct or not.

他必须获得可靠消息。然后他就能判断出他的政策是否正确。

《柯林斯英汉双解大词典》

Mr. Li got the news about the races straight from the horse's mouth.

李先生直接从马嘴中不雅察看到关于赛马的情况。

youdao

You could say you got the information straight from the horse's mouth.

你可以说直接从马嘴获得信息。

youdao

You could say you got the information straight from the horse's mouth.

VOA: special.2009.07.12

Sometimes you get information straight from the horse's mouth.

VOA: special.2009.07.12

Firsthand sources: The best way to ensure information is correct is to take it from the horse's mouth.

CNN: Locating sources and fact-checking

But to hear it all from the horse's mouth is very dramatic.

NPR: Column: Live Commentary On Armstrong Interview

We've got a few screenshots below, and you can also hit the source link for some extra details, straight from the horse's mouth.

ENGADGET: Microsoft adding new features to Hotmail over 'the coming weeks,' releases an Android app