一
先理解核心含义，再看它在真实句子里的用法。
一
the smallest whole number; the numeral 1
He wrote the number 1 on the board.
他在黑板上写了数字1。
最小的整数或代表该数字的数码
the smallest whole number or a numeral representing this number
The answer to the question is 1.
这个问题的答案是1。
In binary, 1 represents true.
在二进制中，1代表真。
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Dictionary facts from ECDICT, WIKTIONARY, WORDNET.