语言研究人员表示，要想让口语效果更好，发音和流利程度是最大的障碍，其次是语法。
Language researchers say pronunciation and fluency are the biggest barriers, followed by grammar, in effective spoken English.
研究人员指出，随着年龄的增长，污染对语言能力的影响更加严重，尤其是在男性和受教育程度较低的人群中。
The researchers noted that the effect of pollution on language ability is even more serious as people age, especially among men and the less educated.
研究人员的实验旨在区分记忆对学习不同语言的影响。
The researchers' experiment was intended to distinguish effects of memory in learning different languages.
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