/pərˈmɪsɪv ruːl/ – Phrase
Definition: quy phạm tùy nghi.
A more thorough explanation: A permissive rule is a legal principle that allows or permits certain conduct or actions, rather than requiring or mandating them. It gives individuals the option to act in a certain way, but does not impose an obligation to do so.
Example: The permissive rule allows the court to admit evidence that would otherwise be considered inadmissible.