Chapter four: Factor analyses on employment problem of villages in cities.

第四章：城中村就业困境的因素分析。

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The four-factor classifying method would play a guiding role in the re-search on database machines.

四要素分类法对数据库机研究将起到指导作用。

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The four-factor formula obtained in the static reactor physics is given for critical calculation.

给出了临界计算所要求的，得自静态反应堆物理的四因子公式。

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They were off by a factor of four.

它们不属于四大元素之一。

麻省理工公开课 - 固态化学导论课程节选

Already from this class if I told you that I gave you energies in some spectrum but they were off by a factor of four, what would you think? Maybe the Z is wrong.

从这节课开始,如果我告诉你我给了你,在某些光谱里的能量,但它们不属于四大元素之一，你会怎么想？也许Z是错的。

麻省理工公开课 - 固态化学导论课程节选

The returns from the alternative strategies were tested against the traditional index benchmarks before and after adjusting for the Carhart Four-Factor Model.

FORBES: No Free Lunch from Alternative Indexes

Airships demonstrate a law of increasing returns: doubling the length increases the surface area (and hence weight) by a factor of four while the volume (and hence lifting capacity) goes up by a factor of eight.

ECONOMIST: Pushing the envelope

As you probably guessed, married moms tend to outearn their single mom counterparts, nearly by a factor of four.

FORBES: Study Shows That Numbers Of Working Moms Have Increased: Is That A Good Thing?