但是大规模延长线路到全国其他地区的计划正在制定中。

But plans are under way to extend the rapid transit to other areas of the country.

youdao

这项计划正在制定之中并为此开展了广泛协商进程，使其能够反映所有利益攸关方（国家、合作伙伴、私立部门和民间社会）的承诺。

The Plan is being developed through a broad consultative process, so that it can reflect the commitments of all stakeholders – countries, partners, the private sector and civil society.

youdao

他正在为将来制定计划。

He was making plans for the future.

《柯林斯英汉双解大词典》