可以预先设定缺省值。注意字典的键值都是小写的。
You can set the defaults in advance. Note that the keys of the dictionary are always lowercase.
本部分将专门描述缺省配置，这样在设定手动对等恢复时可以被修复。
This section aims to describe the default configuration so that it can be restored if manual peer recovery is configured.
如果没有对参数设定显式的范围，那么缺省情况下范围是Object，这意味着我们不能调用范围实例在Object中未曾出现的任何方法。
If we place no explicit bound on the parameter, then by default the bound is Object, meaning that we can't call any methods on an instance of the bound that don't appear in class Object.
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