相反，如果我对捷运系统的乘客每年做一次调查的话，那么我将会错失乘客也许因为季节性的活动而引起态度方面的重要转变。

Conversely, if I survey the commuters on my rapid transit system once a year, I will miss important changes in their attitudes that may be driven by seasonal events.

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国家管理局的一次调查发现儿童和父母在其同龄儿童时期相比，要少花60%的时间在户外活动。

A survey released by the National Trust this year found that they are spending 60% less time in the wild than their parents at the same age.

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该组研究对象中的226人依然在世，其中161人在研究中仍处于活动状态，即每两年回答一份调查问卷，并在每15年接受一次个人访问。

Of this group, 226 are alive and 161 are still active in the study, which requires the men to answer questionnaires every two years and to be interviewed personally every 15 years.

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