Why is the obesity problem in Britain so difficult to solve?

为什么英国的肥胖问题如此难以解决？

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I can understand why astronauts find it difficult to readjust to life on earth.

我能明白为什么宇航员们发现难以重新适应地球上的生活。

《柯林斯英汉双解大词典》

But if improving their hunting luck was the chief motivation for the paintings, it is difficult to explain why only a few show signs of having been speared.

但是，如果增强他们的狩猎运气是这些画的主要动机，那么就很难解释为什么只有少量画作有被长矛刺过的迹象。

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It was difficult for her to understand why she had married.

VOA: special.2009.06.27

But I want you guys to think about why it was difficult to do it another way, which is more pedestrian.

但是我希望你们能思考一下,为什么用另一种更普遍的方法来做,反而会比较难呢

耶鲁公开课 - 基础物理课程节选

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

That is why it is difficult to predict the outcome of these elections, and why when you talk to people in the streets, or go out in restaurants, or interview analysts, you will hear as many scenarios as there are people ready to talk.

CNN: View From Belgrade: Milosevic and the quest for power

That is why it is so difficult to study and why the studies show mixed results.

FORBES: Does NIH recommend acupuncture?

He said the government stood by its commitments in relation to the Cory inquiries but there were particular reasons why it was difficult to move ahead in the Pat Finucane case.

BBC: NEWS | UK | Northern Ireland | Cory reports: what was said