Methods An anonymous survey was conducted among 502 students from a technical college selected by stratified sampling and cluster sampling.

方法采用分层整群抽样的方法对一所职业技术学院的502名学生进行匿名式问卷调查。

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Methods The questionnaire survey was conducted among 1 700 college students with stratified-cluster sampling method.

方法采用分层整群抽样方法对暨南大学在校学生1 700名进行问卷调查。

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Methods Female college students were sampled by cluster sampling and investigated by using questionnaire survey on anonymous basis.

方法采用分层整群抽样方法，对调查对象进行无记名自填式问卷调查。

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In his view, a cluster of cultural prejudices have steered many potential tradesmen into college, and then toward stultifying office jobs, which provide less satisfaction and less security than skilled manual labor, and sometimes less money.

NEWYORKER: Out of the Office

Nor do phones seem to ring much anywhere on the suburban Microsoft "campus, " a cluster of 35 low-rise buildings, lawns, white pines and courtyards that resemble those of a state polytechnic college.

CNN: In Search Of The Real Bill Gates