string symbol

例句：

1. 1. The string symbol connects two parts of the necklace together.
   串珠符号将项链的两部分连接在一起。
2. 2.The string symbol is used to represent a sequence of numbers in a mathematical formula.
   串珠符号用于表示数学公式中的数字序列。
3. 3.The string symbol is often used as a visual aid to help explain complex concepts.
   串珠符号常被用作视觉辅助工具，帮助解释复杂的概念。