这项实验必须以最高严谨度进行，以避免任何误差。

The experiment must be carried out with the highest ___rigor to avoid any errors.

士兵们必须忍受沙漠环境的严酷考验。

The soldiers had to endure the ___rigors of the desert environment.

这所学校的纪律以严格著称。

The school's discipline is known for its ___rigor.