be good at的同义词是do well in，擅长在……方面做得好在……干得好。

例句：He will do well in that work because he has a lot on the ball.

他会做好这件事，因为他很有一手。

另外还有，be skilled in，在…方面熟练擅长精通。

例句：A process is required for this and managers must be skilled in using it.