After the global financial crisis, regulators hugely increased the stringency of rules governing bank balance sheets.

全球金融危机之后，监管机构大幅提高了管理银行资产负债表的规则的严格性。

There were Zones 1, 2 and 3, with corresponding stringency of regulation.

有1区、2区和3区， 监管相应严格。