I know you have misgivings about Aaron.

我知道你对亚伦有疑虑。

He says in the beginning, he had misgivings about accepting the role of a much physically larger character, but he finally took on the challenge.

他说，一开始他对于接受一个体格较大的角色有所顾虑，但是他最终接受了这一挑战。