Picture a finger moving along a row of people: one, two, three. Nobody is asked for a name. All you want is the total, and whether the total matches the number you expected. That finger works at a bus door, at a dinner table, and on a trail. Slide the same finger down a column in a and you get the company use: how many people are on the staff, counted as a plain number.
可以想成一根手指沿著一排人點過去：一、二、三。沒有人被問名字。你要的只是總數，還有這個總數跟預期的合不合。這根手指可以出現在公車門口、餐桌邊、步道終點。把同一根手指移到試算表的一欄上往下滑，就變成公司裡的用法：帳上有幾個人，算成一個數字。
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