Over the years, the rules have evolved to improve performance, lower cost, or to allow replacement of discontinued parts.

The rules of chess have evolved quite a bit over the centuries.

The rule evolved after officials found that even the most troubled clients sometimes find jobs.

Nature's rule won't evolve a species that doesn't have a will to survive.

The rules gradually evolved throughout its history, especially in the Countdown round.

The training dataset will be used to let rules evolve which match it closely.

But it was more likely that radically new rules of law must evolve.

State power threatened to crush liberty, but the rule of law evolved.

Indeed, on an exchange, rules may often evolve out of practice, rather than vice versa.

Those efforts have cooled as the industry waits to see how the rules evolve.