rigidly

adverb [方式副词]严格地；坚硬地；严厉地；牢牢地

Rooms in Mexican houses are locations for multiple activities that, in contrast, are rigidly separated in the United States.
墨西哥房子里的房间都是进行多种活动的场所，与此形成鲜明对比的是，这样的活动场所在美国是有严格区分的。