英语翻译First,Young had her staff construct the average age of N

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英语翻译
First,Young had her staff construct the average age of Northern and Southeast B737-200fleets,by quarter,since the introduction of the aircraft to service by eachairline in late 2001 and early 2002.The average age of each fleet wascalculated by firstmultiplying the total number of calendar days that each aircrafthad been in service at the pertinent point in time by the average dailyutilization of the respective fleet to total fleet-hours flown.The totalfleet-hours flown was then divided by the number of aircraft in service at thattime,giving the age of the "average" aircraft in the fleet.
The averageutilization was found by taking the actual total fleet-hours flown at September30,2010,from Northern and Southeast data,and dividing by total days inservice for all aircraft at that time.The average utilization for Southeastwas 8.3 hours per day,and the average utilization for Northern was 8.7 hoursper day.Because the available cost data were calculated for each yearly periodending at the end of the first quarter,average fleet age was calculated at thesame points in time.
看了一个小时了,数学名词方面实在不懂,
The average age of each fleet was calculated by first multiplying the total number of calendar days that each aircraft had been in service at the pertinent point in time by the average daily utilization of the respective fleet to total fleet-hours flown.
主要是这句

楼主是这句吗?
每架飞机的平均寿命即飞机的总飞行时间是通过首先把在指定时间点处每架飞机都在使用中的日历天的总数/总天数与平均每天每架飞机的利用率相乘来计算得到.

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