在实践中，新规定收效甚微。

___In ___practice, the new regulations had little effect.

当你离开学校时，你有知识但不知道如何在实践中使用它。

When you leave school, you have knowledge but you do not know how to use it ___in ___practice.

这个理论听起来不错，但在实践中更复杂。

The theory sounds good, but ___in ___practice it's more complicated.