像美国的总体社会调查，欧洲民意调查和盖洛普已经收集了许多这个主题相关的数据。
There are already a lot of data on the subject collected by, for instance, America’s General Social Survey, Euro barometer and Gallup.
像美国的总体社会调查，欧洲民意调查和盖洛普已经收集了许多这个主题相关的数据。
There are already a lot of data on the subject collected by, for instance, America’s General Social Survey, Euro barometer and Gallup.
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