"s1"<>"s2"<>...，StringJoin["s1", "s2", ...] 或 StringJoin[{"s1", "s2", ...}]返回由 连接构成的字符串.
连接字符串：
用 InputForm 显示字符串引号：
忽略所有列表：
Join StringExpression Row Characters StringInsert StringReplacePart FileNameJoin
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连接构成的字符串.
连接构成的字符串.