In theory, this is the moment when Putin should finally step down after a quarter of century at the apex of Russian power.

理论上，现在是普金离开他占据了四分之一个世纪的俄罗斯权力核心的时候了。

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In addition, the existing capacity also needs refurbishment because, as it stands today, a quarter of Africa's installed power generation capacity is not operational.

此外，需要对现有发电设备进行更新改造，因为目前非洲有四分之一的装机容量并未投入运营。

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But General Petraeus said he needs time to assess the impact of the loss of one quarter of his U.S. combat power and that further reductions must be based on the situation at the time.

但是，彼得雷乌斯将军说，他需要时间来评估失去四分之一的美军作战力量会带来什么影响，而进一步撤军必须由以后的具体情况来决定。

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You see the difference in electronegativity, square it, multiply it by one-quarter and raise that to the power e.

你看到了电负性的差异，开方，乘以四分之一,在移到e上去做指数。

麻省理工公开课 - 固态化学导论课程节选

E to the power of minus one-quarter times the difference in electronegativity squared.

指数是四分之一,把他乘以四分之一，在移到e上去做指数。

麻省理工公开课 - 固态化学导论课程节选

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