The principal difficulty faced by the schools has been the tremendous increase in the number of pupils.

学校面临的主要困难是学生人数的大量增加。

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These sources preserve different traditions on the number and the nature of the plagues, as well as the principal actors in the drama: God, Moses, Aaron.

这些资料保存了不同的传统关于瘟疫的数量和性质，以及戏剧中的主要角色：上帝，摩西，亚伦。

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The condition appears to result from the cumulative effect of a number of factors, with atmospheric pollutants the principal culprits.

这种情况似乎是由许多因素的累积的结果，而大气污染物是主要的罪魁祸首。

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These sources preserve different traditions on the number and the nature of the plagues, as well as the principal actors in the drama: God, Moses, Aaron.

这些素材都保留了不同的风格,不同瘟疫的数量，内容,关于三个主角，上帝，摩西，主角的描述也不相同。

耶鲁公开课 - 旧约导论课程节选

Core electrons are all those electrons held in really tight with the nucleus in the inner shells, whereas the valence electrons are only those electrons that are in the outer-most shell, or at your highest value of n of the principal quantum number.

芯电子是那些,在内壳层被原子核束缚得非常紧的电子，而价电子只包括,最外层的电子，或者说主量子数，n，的值最大的那些电子。

麻省理工公开课 - 化学原理课程节选

"We were delighted to find that patients who get the current state-of-the-art treatment with platelet blockers, medical treatment and stents during procedures had a significant improvement in their outcome, " said Dr. Christopher Cannon, an assistant professor at Harvard Medical School and a principal investigator for a number of heart-related studies at Brigham and Women's Hospital in Boston, Massachusetts.

CNN: Research closing in on heart disease

This number reflects both the normal principal repayments that come with monthly amortization and the irregular dollops of principal that come when a mortgage is paid off early.

FORBES: Magazine Article

Paul Sherrington, principal of Banff and Buchan College, said the number of full-time equivalent (FTE) staff at the institution had dropped from 237 to 220 over the past two years.

BBC: Part-time Scottish college places cut, say principals