a 1
作为可数名词，用不定冠词a表示“一个数字1”。
Write a 1 in the box if you agree.
如果你同意，请在方框内写一个1。
一
最小的整数或代表该数字的数码
the smallest whole number; the numeral 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
He wrote the number 1 on the board.
他在黑板上写了数字1。
用法提示：这里1作为名词，指代数字一。
The answer to the question is 1.
这个问题的答案是1。
用法提示：这里1作为名词，表示数值一。
In binary, 1 represents true.
在二进制中，1代表真。
用法提示：这里1作为名词，指代二进制中的数字1。
作为可数名词，用不定冠词a表示“一个数字1”。
Write a 1 in the box if you agree.
如果你同意，请在方框内写一个1。
用定冠词the特指某个数字1。
The 1 at the start of the code is missing.
代码开头的1缺失了。
复数形式为1s，表示多个数字1。
The sequence contains three 1s in a row.
这个序列中连续出现三个1。
grammar · medium
易错句子There are three 1 in the number 111.
正确表达There are three 1s in the number 111.
英语可数名词复数要加 -s，而汉语名词本身不随数量变化。这里的“1”是可数名词，所以必须用复数形式“1s”。
grammar · medium
易错句子I don't want the blue 1; I want the red 1.
正确表达I don't want the blue one; I want the red one.
“1”是数字符号，不是代词。英语用代词“one”来避免重复名词，数字“1”不能替代它。
one 是数字1的英文拼写形式，用于句子中；1 是阿拉伯数字符号，多用于数学、编号、列表等。
first 是序数词，表示顺序上的“第一”；1 是基数词，表示数量“一”。
Choose the next layer that will help you use 1 with more confidence.
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