Definition
This idiom indicates that there are no strict or inflexible rules that must be followed.
没有明确的规则
There are no hard and fast rules about how to approach this problem, so we need to be more flexible.
对于如何处理这个问题，并没有明确的规则，所以我们需要更加灵活。
In the field of design, there are no hard and fast rules; creativity is the most important thing.
在设计领域，并没有明确的规则；创意是最重要的。
In interpersonal relationships, there are no hard and fast rules; you need to adjust your behavior based on the situation.
在人际关系中，并没有明确的规则；你需要根据情况调整自己的行为。