A key aspect of transformations is that they enable you to cross levels of abstraction.

转换的一个关键方面是，它们能使您进行各种层级的抽象。

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Now when you look at uranium cross section as a function of energy and that's this neutron energy from EVs to MEV levels.

现在，当你看铀的横截面，是以能量的函数，那是中子能量，从电子伏到兆电子伏水平。

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In Kenya, for example, at current economic growth rates and with the present levels of income inequality, the median family in poverty would not cross the poverty line until 2030.

例如，按当前的经济增长率和目前的收入不平等水平，肯尼亚中等贫穷的家庭在2030年之前将不能跨越贫穷线。

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She said the Laboratory of the Government Chemist was looking at what levels of cross-contamination could take place in "a well-run and hygienic plant" and testing methods were also being looked at.

BBC: Horsemeat scandal: Public quizzed on contamination

Around 40 of the 120 trusts ran into severe difficulties due mostly to stock market falls, as well as high levels of cross holdings and high borrowing to invest in other companies.

BBC: Split caps 'mis-sold'

Strenger is a vocal proponent for improvement in German corporate governance practices, where cross-shareholdings and insignificant disclosure levels have been commonplace.

FORBES: Tricks of the trade