我们对如何提高产量作了研究。

We did research on how to raise the production.

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科学家们作了研究以决定新星的位置。

Scientists did research to determine (on) the position of the new star.

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心理学家对病人听从医嘱的情况作了研究。

Psychologists have studied how well patients comply with doctors' advice.

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Ed Diener University of Illinois professor Ed Diener does a lot of research on happiness levels.

伊利诺伊大学教授,就快乐水平作了大量研究。

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