their attendance increased by an average of six days,or nine percent,during a sixty-five-day term.

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their attendance increased by an average of six days,or nine percent,during a sixty-five-day term.
their attendance increased by an average of six days,or nine percent,during a sixty-five-day term.

their attendance increased by an average of six days,or nine percent,during a sixty-five-day term.
翻译是：在65天的一个周期里,他们的出勤率平均提高了6天,或者说是9个百分点（以百分比形式的话是9%)
其实翻译句子还是要结合上下文的.
这里的一个主要用法就是 increase by 后接程度,这个程度可以是一个绝对的数,也可是一个相对的百分数
例如：Our profit has increased by 10 percent since the new plan was carried out
或者 Our profit has increased by 900 dollars since the new plan was carried out
新计划实施后我们的利润已经上涨10%（后一句是增长了900美元）

attendance attendance attendance attendance attendance 英文的wave attendance wave attendance是什么意思啊?Lenovo guests will enjoy different sporting events according to their wave attendance.这是整个句子！ Inc. attendance是什么意思? attendance是什么意思 Attendance days attendance mandatory SAT改进句子题Because the production company failed to properly advertise its upcoming play,their attendance on opening night,being very low,was not surprising.划线部分为：their attendance on opening night,being very low,was not surprisingA their attendance increased by an average of six days,or nine percent,during a sixty-five-day term. Year of Attendance是什么意思 attendance office是什么意思 certificate of attendance是什么意思 dates of attendance是什么意思 attendance form是什么意思