你想存取字符串的一部分。何如，你读取了一条固定宽度的记录，然后从中提取出其中的字段。

You want to access portions of a string. For example, you've read a fixed-width record and want to extract the record's fields.

youdao

你想存取字符串的一部分。何如，你读取了一条固定宽度的记录，然后从中提取出其中的字段。

You want to access portions of a string. For example, you've read a fixed-width record and want to extract the record's fields.

youdao