They are, in novelist V.S. Naipaul's expression, "half-made societies," trapped between a no-longer-usable past and a not-yet-accessible future.

用小说家v.s.奈保尔的话说，他们是“半成品社会”，纠结于不再可用的历史和还未达到的未来之间。

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The biggest agricultural success story of the past two decades has been Brazil, largely because it was able to increase its usable acreage by making its vast cerrado (savannah-like grassland) bloom.

过去二十年间，最大的农业成功在巴西，很大程度上是因为巴西通过改造塞拉多（大草原般的草地）增加了可耕面积。

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Over the past few years, researchers in the emerging field of "usable security" have taken a hard look at many information security practices and found many of them lacking.

在过去几年，“可用性安全”这个新兴领域的研究者深入研究许多信息安全实践并且发现很多其中很多有缺陷。

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What we want young people to have is a usable map of the past.

BBC: Historians split over Gove's curriculum plans

And what we've seen there over the course of these past weeks is that that determination was correct and that we have gotten quite a bit of usable information that has helped across the intelligence community to keep the American people safe.

WHITEHOUSE: Press Briefing by Deputy Press Secretary Bill Burton