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定义
一种古代长度单位，等于张开手掌从拇指尖到小指尖的宽度，标准化为约23厘米（9英寸）。
解释
Half a cubit, the span was widely used in ancient Hebrew, Greek, and Roman measurement. Goliath's height in the Bible is given as 'six cubits and a span,' roughly 2.9 meters. Like other body-based units, it varied between individuals; standardization came later through royal decrees or reference artifacts. It survives in horse height measurement, where 'hands' (10 cm) replaced the older span.
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