这位教授以学术严谨著称，他的论文总是经过严格的审查。

The professor is known for his academic ___rigor, and his papers always undergo thorough reviews.

学校的新规定执行得非常严格，让学生们感到压力很大。

The new school rules are enforced with great ___rigor, putting much pressure on students.

他突然打了个寒战，知道自己要发烧了。

He experienced a sudden ___rigor and realized a fever was coming.