And scientists have been working on this for years and there's been progress, but it's still a very difficult challenge.

科学家们对此已经研究很久了,并取得了进展,但仍有很大挑战

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because the research went really well.

因为我们的研究进展很顺利。

成功的医学研究 - SpeakingMax英语口语达人

So we had students do research, quantitative research or qualitative research; we had students do literature reviews in a particular area of interest; work proposals for book they want to write; or workshop proposals and those kinds of things.

我们让学生进行研究，量化研究和质化研究;,我们让学生,就感兴趣的领域写文献观后感;,他们计划写的书的进展计划;,或实验计划等等。

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