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

rigor 是名词，来自拉丁语，意思是"严格、严厉、严酷"。在学术或纪律方面常指"严格的标准或要求"。 enforced with great rigor 这个短语表示"以非常严格的方式执行"，强调执行规定时毫不放松的态度。