这可能会因版本而异 - 没有说明确切名称的规范 - 并且故意;以防止可能找到与这些名称有关的聪明事情的代码。

This is subject to change from version to version - there is no specification that says what the exact names would be - and it's done on purpose; well to protect against code that might find clever things to do with these names.