This paper conducted a study of these issues.
本文主要对这些问题进行了研究。
The study was conducted over a period of decades.
这项研究时长超过数十年。
A case study was conducted to demonstrate the success of the module planning method.
实例研究表明，所提出的模块规划方法能够高效地给出合理的结果。
The paper conducted a serious study and try to put forward a number of countermeasures.
对此，本文进行了认真研究，并尝试提出了若干对策。
The paper conducted a serious study and try to put forward a number of countermeasures.
对此，本文进行了认真研究，并尝试提出了若干对策。
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