Three decades of effort have been expended on string theory, which includes gravity but at the expense of having the universe inelegantly sprout hidden dimensions.

而那个花了三十多年努力的“弦理论”，虽然把引力拉扯进来了，代价是让宇宙加几个不知哪冒出来的维度。

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This is not just theory; it is a lesson we learned, at great expense, during the Savings and Loan crisis of the 1980s.

这不只是理论；它是我们经历了1980年代的储贷危机以巨大的代价所习得的教益。

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Yet graduate schools of education often focus on theory at the expense of practice.

现在教育学院的研究生教学更多的集中的理论，而丧失了实践机会。

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The theory was to spare cable operators the time and expense of negotiating licenses with the myriad owners of content that was being broadcast over the air.

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That is in theory a deductible business expense, but often it must be capitalized into the cost of the vines depending on how you legally structure your operation.

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