一定成功的

Given the distance between my previous role as a convention gate-crasher and my newfound role as convention keynoter, I had some cause to worry that my appearance in Boston might not go very well.

我在上届大会角色是擅闯会者，而这届大会是主要发，于这两个角色巨大差距，我有一定理担心，我在波士顿也许不会十分成功。