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

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theirattendanceincreasedbyanaverageofsixdays,orninepercent,duringasixty-five-dayterm.theirattendance

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)