In the past few years, several high-quality studies have failed to show that extra vitamins, at least in pill form, help prevent chronic disease or prolong life.
过去几年里，一些高水平研究显示额外的维生素，至少维生素片，并没有能防止慢性病或者延长人的寿命。
New studies by Pew Research show the divorce rate has declined over the past 20 years, but at the same time, fewer people are getting married.
皮尤研究机构的新研究显示过去20年期间，离婚率下降，但与此同时，结婚的人数也少了许多。
Several studies over the past few years have suggested an increase in heart disease among men receiving hormone therapy for prostate cancer. Not all studies show such a risk.
一位心脏、癌症和泌尿学组织的的专家组成员警告说：接受激素治疗前列腺癌患者可能增加心脏病风险。
Past studies have shown that the insects use the sun as a compass to show them the way.
以往的研究证明这些小昆虫把太阳当作指南针，为它们指路。
Past studies have shown that the insects use the sun as a compass to show them the way.
以往的研究证明这些小昆虫把太阳当作指南针，为它们指路。
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