As usual, Kobe Bryant and Shaquille O'Neal proved, at times, unstoppable.
Even new buildings with up-to-date safety equipment have proved at times to be death traps.
It proved, at times, a dicey operation: at one point, they received a court summons for correcting a federal sign at the Grand Canyon.
Mr. Kumar, for his part, proved at times to be a combative witness, telling Mr. Dowd that his assertions were "wrong" and "absolutely incorrect".
The mixture of biography and formal analysis proves, at times, disorienting as we flit between discussions of prosody and of infidelity.
Politically, it's an admirable project - if one for which the conventional novel continues to prove, at times, a very constricting vehicle.
The series' unflinching examination of the difficulties and prejudices faced by a transgender woman at the hands of other prisoners has also proved at times a challenge for the cast.
In Alaska, Ms. Palin proved at times to be a nuanced figure — someone who was certainly capable of going on the offensive, but who also worked with Democrats as governor and built unlikely coalitions.
What is it worth quantifiably and qualifiably?" One bit of good news, transit planners say, is that the authority — rarely seen as avant-garde — has proved at times quite resourceful since the storm, turning repeatedly in recent months to ideas that might have once seemed absurd.
In spite of his great gifts as a writer, his sensitivity as an observer and the learning displayed in the variety and aptness of his quotations from his readings, Mr. Butor's narrative style proves, at times, to be monotonous, if not frankly irritating.
