The source had long been known but not exploited.

该来源早已为人所知， 但未被利用。

And from this underused realistic muscle flows a much underappreciated capacity to take difficult thoughts on board.

从这块未被充利用的现实肌肉中，流淌出一种未被充的力，即接受困难的想法。

And in addition, Kenya is endowed with excellent wind and solar resources that have also barely been exploited.

此外，肯尼亚拥有得天独厚的风和资源，也几乎未被开发利用。

Well, another quick win could  be to integrate airports into the system - particularly  those that are underused.

那么，另一个速战速决可是将机场整合到系统中——尤其是那些未被充利用的机场。

Honestly, if you look around, you will find underutilized space everywhere, under, around and inside of urban developments.

老实说，如果你环顾四周，你会发现城市开发项目的地下、周围和内部到处都是未被充利用的空间。