For two months, the study subjects ate three meals a day.
2个月以来，研究对象一日吃三餐。
Study subjects were divided into three age groups.
研究对象被划分为三个年龄段。
In a second study, subjects were invited to do a cookie taste test.
在第二项研究当中，被试者应邀参加了一次曲奇饼品尝试验。
In a second study, subjects were invited to do a cookie taste test.
在第二项研究当中，被试者应邀参加了一次曲奇饼品尝试验。
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