有趣的是，一些研究显示，白种美国儿童对童年的记忆比韩国儿童早。
It is interesting to note that some studies show Caucasian American children have earlier childhood memories than Korean children do.
然而，一些研究显示了一个严重的问题：现在的青少年缺乏媒体素养。
However, several studies have shown a serious problem: today's teenagers lack media literacy.
一些研究显示糖精和啮齿动物的癌症有关。
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