This study evaluated the prevalence of protein energy malnutrition (PEM) in children under five years (n = 52), in three randomly selected, State operated foster care institutions in Sri Lanka.
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For the study, the five professors surveyed some 4, 000 Americans, asking what they did the previous day and then quizzing them in detail about three randomly selected events from the day.
这五位教授在研究中调查了约4,000名美国人，询问他们前一天做了什么，然后就其中随机选取的三件事询问详情。
For the next three weeks, 20 randomly selected study participants had their viewing cut in half.
在接下来的三个星期里，研究者们随机挑选了20个参与者，将他们看电视的时间减少一半。
In almost every one of those games the player selects three or more Numbers, and those Numbers are compared against Numbers randomly selected by the state lottery to determine who is the winner.
大多数彩票都是选3个以上的号码，选的号码和各州的摇奖机随机摇出的号码比较看谁中了奖。
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