Ovulation rate is the principle factor limiting litter size in gilts and increasing the level of feed intake prior to mating will significantly increase ovulation rate.

排卵率是限制母猪窝重的主要因子，在配种前提高采食量能显著性地增加排卵效率。

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By using principle factor analysis, four dimensions were identified. They are the sense of time efficacy, the sense of time value, initiative in time using and time management strategy.

通过主成分分析法，确定出大学生时间管理倾向的四个构成维度，分别为时间效能感、时间价值感、利用时间的主动性和时间管理策略。

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Results:Exploratory principle factor analysis of the items indicated that the scale had two factors-striving for high goals and minding mistakes, explaining 51.6% of the total variance.

结果：探索性因素分析确定量表含追求高标准和在乎错两个因素，解释总变异的51.6%；

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That cost insulation is the principle factor driving the explosion of health care spending.

FORBES: How Tax Reform Facilitates Health Care Reform

The final principle is a thorough understanding of the human factor.

ECONOMIST: It's best for governments not to know too much