By contraries, little research have been done on concurrent object-oriented languages.

相反，对于并发面向对象语言，人们研究得较少。

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A lot of research have been done on sequential object-oriented languages with many achievements.

对于顺序面向对象语言，人们研究得比较多，并取得了许多成果。

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Theoretical and experimental research have been done for external TWT equalizer by using microstrip circuit.

利用微带电路作成的行波管外平衡器的理论研究和实验工作已经完成。

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Unfortunately, recent surveys which have been done as part of our research programs at the Center for Effective Organizations show that most organizations do not integrate social and environmental performance into the way the organization operates.

FORBES: Forget Sustainability Programs

Having been in both academia and industry, Lord Oxburgh said he has no doubt that in industry, where companies, not researchers, own the data, the record-keeping would have been better, but that the team would have done much less good research.

ECONOMIST: Climate science and its discontents: A place in the sun | The