另一项发表在《经济学与统计学评论》上的研究报告称，父母所付出的努力是十分重要的。
Another study, published in the Review of Economics and Statistics, reports that the effort put forth by parents is extremely important.
对田纳西州志愿学前教育项目的一项皮博迪新研究报告称，学前教育是有效的，但这种效果不会持续到三年级。
A new Peabody study of the Tennessee Voluntary Pre-K program reports that pre-K works, but the gains are not sustained through the third grade.
一项最新研究调查显示，新生们已经表现出压力很大了，该研究报告称目前学生的情绪健康水平处于1985年该调查开始以来的最低水平。
Freshmen are showing up already stressed out, according to the latest research study that reported students' emotional health levels at their lowest since the survey started in 1985.
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