We can similarly calculate that the average piano tuner performs (50 weeks/year) × (5 days/week) × (8 hours/day) ÷ (2 hours to tune a piano) = 1000 piano tunings per year.
类似地计算出平均每个调琴师 (50 周/年)×(5 天/周)×(8 小时/天)/(1 架钢琴/2小时) = 1000 架钢琴每年/1调琴师。