The theories of the product composition, life cycle and Bostons matrix are followed. Theory study and investigate study are adopted and quantitative analysis is combined with qualitative analysis.

本文遵循产品组合理论、产品生命周期理论及波士顿矩阵理论，采用了理论联系实际、定量分析与定性分析相结合的方法。

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These are some of the questions that you investigate when you study English.

这些是你在学习英语时要研究的一些问题。

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Otherwise, academics will continue to think dangerously alike, increasingly detached from the societies which they study, investigate and criticise.

否则，学者们将继续以类似的危险方式思考，越来越脱离他们所研究、调查和批评的社会。

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La Brea scientists had a chance to investigate an area that otherwise would have been impossible to study.

VOA: special.2010.04.07

Otherwise, academics will continue to think dangerously alike, increasingly detached from the societies which they study, investigate and criticise.

ECONOMIST: The difficulties of an American doctoral student

The first study to investigate the question of whether people can actually die of heartbreak was published in the British Medical Journal in 1969.

FORBES: More Die of Heartbreak, More Often Than You Might Think

This was the first study to investigate Tekturna for more than one year in a specific population of patients with type 2 diabetes and renal impairment.

FORBES: ALTITUDE Study of Aliskiren Terminated Early by Novartis