A scientific study is one which is based on the systematic investigation of data, conducted with reference to some general theory of language structure.

语言学是对语言进行科学地研究的学科。它所研究的并不是某种特定的语言，而是人类所有的语言的共性。

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Methods the baseline investigation was conducted on health knowledge and health behavior among the students in some primary and middle schools.

方法对部分中小学生健康知识和健康行为开展基线调查。

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In order to obtain more detailed information about students' autonomous problems, interviews were conducted on some participants as a follow-up investigation of the questionnaire.

问卷完成后，又与部分学生进行了访谈，以便更加深入地了解学习者在自主学习方面存在的问题。

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As we noted in a previous article, Why Pension Investment Advisory Fees Are So High, January 2003, an investigation we conducted recently revealed that some funds were paying as much as four times what others were for identical investment management services.

FORBES: Time��s Running Out For America��s Pensions (May 1, 2003 )