make a study of

例句：

1. 1. We need to make a thorough studyof the new policy before implementing it.
   在实施新政策之前，我们需要彻底研究一下。
2. 2. The scientist made a careful study ofthe sample to determine its composition.
   科学家仔细研究了样本以确定其成分。
3. 3. Thebook is an excellent resource for making astudy of ancient history.
   这本书是研究古代历史极好的资源。