Such programs are much needed because in many arid lands there is only a vague idea of the extent of groundwater resources.

这样的计划是非常必要的，因为在许多干旱地区，我们并不清楚其地下水资源的范围。

youdao

Such programs are much needed because in many arid lands there is only a vague idea of the extent of groundwater resources.

这样的计划是非常必要的，因为在许多干旱地区，我们并不清楚其地下水资源的范围。

youdao