经过几周的进步后，孩子的语言能力又退步了。

After weeks of improvement, the child's language skills ___regressed.

我们需要对这两个变量进行回归分析以确定它们之间的关系。

We need to ___regress these two variables to determine their relationship.

由于道路施工，我们不得不倒退两百米绕行。

Due to road construction, we had to ___reverse 200 meters to take a detour.