One by one to reach

Researchers raised one set of reef fish larvae in normal seawater and one set in water containing twice as much CO2—the level that the Pacific Ocean is expected to reach by 2100.

研究人员将一批鱼苗饲养在正常海水中，将另一批鱼苗饲养在二氧化碳浓度高出普通值一倍-预计在2100年太平洋中的二氧化碳浓度-的海水中。

You'll never reach true Open Closed nirvana, but you can inch much closer by rigorously following the related Single Responsibility Principle: a class should have one, and only one, reason to change

你永远也达不到真正的开闭天堂，但是通过严格地遵循与之相关的单一责任原则：一个类应该有并且只有一个更改的理由，你可以非常靠近地接近它。