From the beginning, the cloud hanging over the whole hydrogen enterprise has not been the power source as such, but the intractable difficulty of distributing and storing the stuff.

从一开始，盘旋在氢能源开发企业头上的阴云已经不是像这样的动力来源的问题，而是那些棘手的配送和储存原料的难题。

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Ms Showalter does not attempt to unravel the intractable moral and legal conundrums raised by this unsettling parable, but she USES it as a metaphor to ask questions about literary judgment.

肖沃尔特并不想通过这个令人不安寓言来阐释道德和法律上的难题，她是想用这个故事作类比，对文学界的固有看法提出质疑。

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When America summoned leaders to Madrid in 1991 to sort out the most intractable Middle Eastern mess, the Arab-Israeli struggle, some grumbled, but all fell into line.

1991年，当美国召集该地区各国领导人赴马德里参加中东和会，以解决中东地区最棘手的问题，阿以冲突时，虽然有人发发牢骚，但都纷至沓来。

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Our trouble is not the over-all absence of smartness but the intractable power of pure stupidity, and no machine, or mind, seems extended enough to cure that.

NEWYORKER: The Information

From the beginning, the cloud hanging over the whole hydrogen enterprise has not been the power source as such, but the intractable difficulty of distributing and storing the stuff.

ECONOMIST: Tech.view: Hydrogen tries again | The

But they also acknowledged the intractable dilemma at the heart of this sort of conservation.

ECONOMIST: Wild-life conservation: Landscape or animals first? | The