an insignia worn to indicate years of service 同义词：service stripe, hashmark,
例句与用法
1.
Lines beginning with a hash mark are comments and should be ignored 以井号（ ）开头的行是注释，应该被忽略。
2.
If you wish to set such a key you must first remove the leading hash mark that marks it as a comment 如果您希望设定这些值，您必须先移掉该行首的井字号。
3.
In compact syntax , you can avoid thinking about namespaces by adding an annotation with initial double hash marks 在紧凑语法中，您可以通过添加一个带有以两个井号标记开头的注解来避免考虑名称空间：
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