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在现代标准汉语中，数词2在不同情况下，常常需要变换用字以适应需要，这一点在其他数词中是不存在或罕见的。 用“二”及“贰”的情况 [ 编辑 ]
The digit used in the modern Western world to represent the number 2 traces its roots back to the Indic Brahmic script, where "2" was written as two horizontal lines. The modern Chinese and Japanese languages (and Korean Hanja ) still use this method.
I wanted to take two weeks ' holiday, but could only take one because the office was so busy. Asia and Africa are the two biggest continents. Due to roadworks, three lanes of traffic have to converge into two. There are one or two typing errors in the report. I spent two years in Ethiopia.
贰字字形字形演变. 形声字。. 从贝，弍声。. “弍”，古文“二”字，西周 金文 从戌，春秋金文从戈（戌、戈均像兵器形，作意符时可以通用。. 字形2脱落“=”形）；秦汉文字承袭西周金文的写法，亦从戌（字形3、5、6“戌”中的短横与“=”的首画共用一笔 ...
2：是一个自然数，同时也是1和3之间的正整数，也是偶数。如果一个整数能被2整除，就是偶数，反之则是奇数。2是最小的质数（也叫素数），也是唯一的偶质数，只有1、2两个因数，是一个有理数。2也是黑格纳数。
