In order to save the problem, it is necessary to make a systematic and thorough investigation and study.
要解决问题，还须做系统而周密的调查研究工作。
In this paper, the geological relic landscape resources in the area are estimated in detail on the base of thorough geological investigation and study.
本文在比较深入的地质调查和研究的基础上，对区内地质遗迹景观资源进行了较详细的评价。
The case study is a thorough investigation of a single case of behaviors or matters. Its purpose is to explore the causality between these behaviors and matters.
个案研究指对某种行为或事物单一案例的深入调查，其目的是探索行为或事物之间的因果关系。
The case study is a thorough investigation of a single case of behaviors or matters. Its purpose is to explore the causality between these behaviors and matters.
个案研究指对某种行为或事物单一案例的深入调查，其目的是探索行为或事物之间的因果关系。
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