in a way that shows you are confident, in control, and expect to be respected and obeyed

He speaks his mind quickly and authoritatively. 他迅速且不容置疑地说出了自己的想法。

It's amazing what you can achieve when you clearly and authoritatively insist. 当你明确而自信地坚持你的要求时，你能取得惊人的成就。

in a way that is complete and accurate or done by an expert, and therefore can be respected

In this book the author authoritatively sets out the evidence on the problems facing the economy. 在这本书中，作者权威地阐述了经济所面临的问题的证据。

The recommended standards have been authoritatively formulated and reviewed by a panel of experts. 推荐标准由专家组权威地制定并审查。