当您设置mcauser属性的值时，应该将值包括在单引号中，以避免分布式平台上的区分大小写问题。
When you set a value for the MCAUSER attribute, enclose the value in single quotes to avoid issues with case sensitivity on distributed platforms.
第一，在创建字符串时，您可以混合使用单引号和双引号，只要字符串在开始位置和结束位置使用同一类型的引号。
First, you can mix single and double quotation marks when creating a string, as long as the string USES the same type of quotation mark at the beginning and end.
在处理字符串数据时，可以使用双引号或单引号分隔。
When working with string data, you can use either double quotation marks or single quotation marks to delimit them.
在选择单引号和双引号时要小心。
Be careful about your choice of single versus double quotation marks, as well.
在选择单引号和双引号时要小心。
Be careful about your choice of single versus double quotation marks, as well.
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