aver

辩护律师断言，案发时他的当事人在数英里之外。

The defense attorney ___averred that his client was miles away at the time of the crime.

尽管有人质疑，这位研究员坚称她的团队在三次独立实验中观测到了这种稀有粒子。

Despite the skepticism, the researcher ___averred that her team had observed the rare particle in three separate trials.

我可以毫不犹豫地断言，这家餐厅的服务从未如此好过。

I can ___aver without hesitation that the service at this restaurant has never been better.