If industrial agriculture is to be replaced, what is a viable alternative?

如果工业化农业要被取代，那么可行的替代方案是什么呢？

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Assisted migration could become a viable part of our rescue strategy, but there are a number of uncertainties and risks.

协助移徙可能会成为我们救援战略中可行的一部分，但也有一些不确定性和风险存在。

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In the late 1700s James Watt designed an efficient and commercially viable steam engine that was soon applied to a variety of industrial uses as it became cheaper to use.

18世纪晚期，詹姆斯·瓦特设计了一种高效的、商业上可行的蒸汽机，随着它的使用成本越来越低，它很快被应用于各种工业用途。

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He said that a small-scale counterterrorism effort is not a viable alternative to the broader military operation now underway.

VOA: standard.2009.10.26

Okay, so 1 is a viable answer in some contacts that needs constant time, the same amount of time no matter what.

在需要常量时间的情况下,答案是1，不管怎样，总时间是,相同的。

哈佛公开课 - 计算机科学课程节选

Now, recruiting is tremendously important because you need to have a certain number of settlers to make the settlement viable.

招募是极其重要的,因为你需要有一定数量的移民,来维持居住地的运转

耶鲁公开课 - 古希腊历史简介课程节选

Is low-impact, nature-oriented travel as viable a moneymaking option as standard resort tourism?

FORBES: Can Eco-Tourism Help Underdeveloped Countries?

But she also questions how viable a product Glass is, knowing that 3D televisions has struggled to catch on.

FORBES: Why iWatch And Google Glass Could Make Smartphones Dumb

We can do this at a price which is viable for a few off grid applications.

FORBES: Solving Climate Change: It's the Technology, Stupid