Many number systems are based on 12 because it's divisible by the most numbers, and because you can count to 12 on one hand by using your thumb to count three knuckles on each of the other fingers. If 11 and 12 are being used more frequently, the forms for them will stick, even when another system starts to develop.

许多数字体系都是基于12的，因为12可以被多数数字约分，还因为你可以一只手仅靠大拇指，数每个指头的指节，就能数到12。要是11和12如今运用更广泛的话，其形式便会固定下来，即便有其它体系慢慢发展起来。

You can extend that idea to other number words. We have more irregularities of pronunciation in the tens (twenty, thirty, fifty instead of twoty, threety, fivety) because we've been making everyday use of those numbers for longer than we have for two hundred, three hundred, and five hundred). 。Thousand is an old word, but its original sense was "a great multitude," a non-numerically-specific, but very useful idea. The words we needed earliest, and used the most frequently are usually the most irregular.

这样思想可以类推到其它数字。几十的数字发音不规律(twenty, thirty, fifty 而不是twoty, threety, fivety)。一千是个古老的词，最初的意思是“量很大”，具体数值不详，但这一概念很有用。有些词汇我们很早就有需要、 使用频率最高，也恰是最不规则的。

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