authoritative

She addressed the group with an authoritative voice.

她用命令式的语气对那群人讲话。

The first authoritative study of polio was published in 1840.

关于小儿麻痹症的首篇权威研究报告发表于1840年。

In their book, the authors provide the most authoritative volume to date that describes—and more importantly predicts—how the Internet will shape our lives in the coming decades.

在他们的书中，作者提供了迄今为止最权威的书籍，描述了（更重要的是预测了）互联网在未来几十年将如何改变我们的生活。

Some authoritative analysts doubt that the secretary would get better deals than private insurers already get.

一些权威分析人士怀疑，部长能否谈下比私人保险公司更好的交易。