This will be particularly true since energy pinch will make it difficult to continue agriculture in the high-energy American fashion that makes it possible to combine few farmers with high yields.

这种困难将是确定无疑的，因为能源的匮乏将使高能量消耗的美国农业模式难以继续下去，而这种模式使投入少数农民就能获得高产成为可能。

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He writes: "In the UK, we have found it increasingly difficult to continue to justify two particular aspects of the present rules on the succession to the Crown."

他在信中写道：“在英国，我们发现越来越难以就《王位继承法》中两个方面的正当性进行辩护。”

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The traditional increasing way with the characteristics of high consumption, high emission and low efficiency makes the resource difficult to continue and causes environment hard to bear.

我国传统的高投入、高消耗、高排放、低效率的增长方式，使资源难以为继，环境难以承受。

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But it became increasingly difficult to continue the crackdown as the protests grew to hundreds of thousands of people.

VOA: standard.2009.11.17

Why has it been so hard and why does it continue to be difficult to identify these pluripotent cells within tissues?

为什么会那么难呢,为什么在组织中识别多能干细胞,始终困难重重呢

耶鲁公开课 - 生物医学工程探索课程节选

But for all that, thinking about those facts make it rather difficult, while you're thinking about the facts, to continue enjoying kissing the person.

但是尽管如此，想到这些事实让继续享受亲吻，变得困难了，当你想到这些事实时。

耶鲁公开课 - 死亡课程节选

Many treatments for acne cause redness, itching and irritation, which make it difficult to continue using them.

CNN: How can I get rid of my acne?

It is difficult to continue to come up with new features and functions, especially when trying to outdo what you have done before.

FORBES: iPhone Passes BlackBerry, But The Race Is Far From Over

Under bankruptcy protection the courts can relieve a company of its debts and rescind contracts that make it difficult to continue in business.

ECONOMIST: The sick cope best with labour pains | The