We compared Los--we couldn't go back in a time machine and do questionnaire surveys in the 1880s, but we could do it in the 1980s.

我们不能坐着时光机,回到19世纪80年代去做问卷调查,但是在20世纪80年代却可以

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And I sent home a questionnaire, asking their parents because most of the children in the class come from other countries. In fact, just about everybody in America comes from another country if you trace far enough.

我还给家长们发了一张问卷，因为班上,大部分学生来自,其它国家，事实上，如果追根溯源，任何一个美国都来自,其它国家。

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The diet diary--the food frequency is a different kind of questionnaire.

饮食日记,食用频率,是另一种问卷调查方式

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