The Washington Post surveyed its readership and discovered that ask people what they thought was the most significant causes of the shooting.

华盛顿邮报》在读者中进行了调查,并且发现当询问人们,他们认为,枪杀案发生的主要原因是什么。

麻省理工公开课 - 媒体、教育、市场课程节选

The one theory made some investigations of earth spores, hoping to find-- what do you call that stuff that floats around and makes you sneeze? Pollen.

有种学说对于,土地孢子进行了调查,期待发现,通过植物种子的变化推定气候状况的方法

耶鲁公开课 - 古希腊历史简介课程节选

And then they were tracked over time.

一段时间后，还对他们进行跟踪调查。

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