單位數的用法和樣例：
例句
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以記錄、區域或控制塊中的任意起始點到另一個點之間的測量單位數。
The number of measuring units from an arbitrary starting point in a record, area, or control block, to some other point. -
在一單位長度內包含的有用信息單位數。通常用每英寸多少單位表示。
The number of units of useful information contained within a linear dimension, usually expressed in units per inch.
