他确实知道 meaning in English

and when he knew for certain

Unlike most of his contemporaries in hollywood, hart actually knew something of the old west .
哈特与好莱坞大多数和他同时代的人不同，他确实知道一些昔日西部的情况。
A presidential associate inevitably tends to overrate the significance of the things he does know about .
一个总统的幕僚对于他确实知道的事情，总难免要过分强调其重要性。
He does know who did it
他确实知道谁干的这事。
He really knows how to work the pitcher and work the count and that ' s become a trademark of the yankees and a big reason why they ' re able to get rid of starters by the fifth inning so many times
他确实知道如何让投手多投些球在球数上取得领先，这已经成为洋基的特色也是他们能多次在五局后击溃先发投手的原因。