Constraints (e.g., a payment cannot exceed a certain value) and derivation rules (e.g., the computation of interest), especially when these are relevant to more than one use case.
限制因素(举例来说，一个支付不能够超过一个特定的数值)和推导规则(举例来说，利息计算)，尤其当这些不仅仅与一个用例相关时。
No matter what rules you come up with for such a derivation, there will likely exist some scenario which breaks those rules.
无论您对其采用什么派生规则，都可能出现打破那些规则的场景。
The curvature image of fingerprint was calculated by using difference derivation, and the core point was searched complying with certain rules.
该算法利用差分求导的方法求得指纹的曲率场，并按照一定的规则搜索参考点。
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