subscript character
collocation下标字符
The chemical formula H₂O uses a subscript character for the 2.
化学式 H₂O 中的 2 使用下标字符。
下标
subscripts — plural of subscript
先理解核心含义，再看它在真实句子里的用法。
下标
A letter or symbol written slightly below the surrounding text.
In the chemical formula H₂O, the subscript 2 shows there are two hydrogen atoms.
在化学式 H₂O 中，下标2表示有两个氢原子。
排版术语，如 H₂O 中的 2。
低于周围文字的字体形式。
A type of lettering form written lower than the things around it.
下标字符或符号,位于另一字符下方或侧下方
a character or symbol set or printed or written beneath or slightly below and to the side of another character
数组或哈希中的索引。
An index into an array or hash.
When you see a variable like x₁, the subscript makes it clear which value in the sequence it represents.
当你看到像x₁这样的变量时，下标能清楚地表明它表示序列中的哪一个值。
To access an element in an array, you often provide its subscript in the code.
要访问数组中的元素，你常常需要在代码中提供它的下标。
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下标字符
The chemical formula H₂O uses a subscript character for the 2.
化学式 H₂O 中的 2 使用下标字符。
数组下标
In C, an array subscript starts at zero.
在 C 语言中，数组下标从零开始。
下标记法
Use subscript notation to label the sequence terms.
使用下标记法为数列各项作标记。
设为下标格式
Format the '2' as subscript in the equation.
将方程中的 2 设为下标格式。
下标表达式
The subscript expression must evaluate to an integer.
下标表达式的值必须是整数。
Use subscripts naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想：sub（下）+ script（写）→ 写在下面的字符，即下标，如 H₂O 中的 2。
语域：neutral 常见场景：Typography and typesetting、Math and chemistry formulas、Programming (array/hash indexing) 作名词时通常用于技术或书面语境，多出现在排版、数学/化学公式和编程文档中；日常口语里较少单独使用，一般直接说“下标”。
这些词都含有 -script 拼写，但重音和元音不同：subscript 重音在第一个音节 /ˈsʌb/，因此与重读 /skrɪpt/ 的词并不押韵。script 与 nondescript 彼此押韵，但它们的元音和重音都与 subscript 不同；别被拼写误导。
Dictionary facts from ECDICT, WIKTIONARY.