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英译汉翻译Professor Beilock says those who sat quietly scored an

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英译汉翻译
Professor Beilock says those who sat quietly scored an average of twelve percent worse on the second test. But the sutdents who had written about their fears improved their performance by an average of five percent.
这些单词的意思我都能理解,但是就是翻译不出来.希望朋友们在翻译的时候能给我指出 有哪些 短语 或者 句型!谢谢!
英译汉翻译Professor Beilock says those who sat quietly scored an
Beilock教授说那些第一轮测试中保持沉默的学生,第二轮测试成绩普遍比第一轮测验成绩平均低十二个百分点,而那些第一次测试中勇于表达出自己恐惧的学生,第二轮测试成绩的表现平均比第一轮高五个百分点.
短语:an average of 平均是.