We must make a careful study of this problem.
我们要好好研究一下这个问题。
You must make a careful study of this article.
你必须仔细研究这篇文章。
Make a careful study of the viability of your chosen operating environment.
对所选操作环境的可行性进行仔细研究。
Make a careful study of the viability of your chosen operating environment.
对所选操作环境的可行性进行仔细研究。
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