Secondly, a thorough investigation and study into a cement plant is put up.
其次，本文对一家水泥企业进行了深入的研究。
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。
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