We often go out to make social investigations.

我们常出去作社会调查。

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Last term, we went to a local paper mill to do some social investigations.

上学期，我们去当地一家造纸厂做社会调查。

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Reading three classical novels and making some social investigations are assignments for the students during the holiday.

学生假期的任务是读3本古典小说和做社会调查。

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According to the Electronic Freedom Foundation, social networks are being used by federal investigators, and last week the privacy organization released a 38-page PDF training course (obtained through the Federal Freedom of Information Act) that the EFF said was used for conducting investigations via social networks.

FORBES: Be Careful Who You Know

The next stage included detailed geological investigations and discussions over the social and economic implications.

BBC: Cumbria Nuclear waste store rejection upheld

Just days before the general election in June, Colonel Jan Kubice, a senior crime-fighter, presented to a (supposedly) closed session of parliament a report claiming that members of the governing Social Democrat party had been interfering in investigations of organised crime.

ECONOMIST: Central and eastern Europe