研究人员会询问受访者进行之前所指出的36项保持体重方法的平率，以“经常，非常频繁”和“很少，从不”来区隔。

The researchers asked them how frequently they employed the 36 previously identified techniques: "often or very often" or "seldom or never."

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Google刚刚宣布现在他们可以利用世界银行的公开数据来为“巴西妇女生育率”、“美国互联网用户”等查询问题提供相关图表。

Google just announced that it now USES public data from the World Bank to display graphs for queries like "children per woman in Brazil" or "Internet users in the United States."

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但这样的事后询问一般会低估其它的一些指标，例如儿童死亡率。

But such retrospective questions have been found to underestimate other indicators, such as child mortality.

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