Yi Jianlian was good in the CBA, but why did he get worse in the NBA?

The level difference is too big. Any player in the NBA who goes to the CBA will be an All-Star. Ah Lian’s physical fitness is considered strong in the CBA, but in the NBA, there are many players who are much better than him. , there is no advantage at all. He will have to adapt slowly and train hard. He will definitely become an All-Star in a few years.