双语囧研究：11为啥英文不叫ONETEEN？English number words are pretty logical after a point。 From twenty-one to ninety-nine， the same principle applies： the tens place followed by the units place。 But the teens are different。
英文数字从某个数开始就相当符合逻辑。从21到29，运用的都是相同的理论：几十在前，后面跟着个位数字。但十几却并非如此。
Eleven and twelve come from the Old English words endleofan and twelf， which can be traced back further to a time when they were ain+lif and twa+lif。
11和12来自古英语endleofan和twelf，可以追溯到俩数字还写作ain+lif和 twa+lif的时候。
So then the question is， why don‘t