The challenges are to make these environmentally, socially, and economically viable.

挑战在于如何使这些项目在环境、社会和经济上变得可行。

While their abundant, they're not often found in quantities that make extraction economically viable.

它们虽然很丰富，但通常不足以开采来推动经济发展。

Critics say it is difficult to see how arcologies could be made economically viable in the near future.

批评人士说，很难看出在不久的将来这种生态建筑如何在经济上可行。

Chandragupta's son, Bindusara, inherited  the stable and economically viable kingdom.

Chandragupta 的儿子 Bindusara 继承了稳定且经济上可行的王国。

The key question is can we find the short-term, economically viable business models?

关键问题是我们能否找到短期的、经济上可行的商业模式？

It's somebody who makes a club that is producing things that are economically viable.

是某个人创建了一个生产经济上可行的产品的俱乐部。

And while they're abundant, they're not often found in quantities that make extraction economically viable.

虽然它们很丰富，但它们的数量并不经常使开采在经济上可行。

We decided to not only make it tangible but make it safe, sustainable and economically viable.

我们决定不仅让它有形，而且让它安全、可持续和经济可行。

There were civilian uses too, but not many, as larger reactors went  on to become more economically viable.

也有民用用途，但数量不多，因为更大的反应堆在经济上变得更加可行。

" There is reason why, north America could not be the most prosperous, and the most economically viable place in the world in the 21st century."

“这就是北美不能在21世纪的世界中成为最繁荣、最具经济效益地区的原因。”

Volatile and, at times, violent conditions are a challenge to the U.S.Agency for International Development's (USAID) effort to help build a stable and economically viable Haiti.

动荡、有时甚至是暴力的环境对美国国际开发署(USAID)帮助建立一个稳定和经济上可行的海地的努力是一个挑战。

The American Civil War, beginning in  1861, had interrupted global cotton supplies, and made cotton cultivation elsewhere in the  world far more economically viable.

1861 年开始的美国内战中断了全球棉花供应，并使世界其他地方的棉花种植在经济上更加可行。

" The government of Greenland supports the responsible, sustainable, and economically viable development of their natural resources to include mining of a broad range of minerals, " Sfraga said.

“格陵兰岛自治政府支持对其自然资源进行负责任、可持续和经济可行的开发，包括广泛的矿产开采。”

However, mass production of televisions for the consumer market, and general improvements in processors and memory, meant that by 1970, it was economically viable to replace electromechanical teletype machines with screen-based equivalents.

然而，面向消费市场的电视机的大规模生产，以及处理器和内存的普遍改进，意味着到 1970 年，用基于屏幕的等效设备取代机电电传打字机在经济上是可行的。