Command Execution
当命令解析完成其任务且命令注册已解析时，命令执行会执行运行代码的艰巨任务。
When command parsing has done its job and command registration has been resolved, command execution does the hard work of running the code.
当命令解析完成其任务且命令注册已解析时，命令执行会执行运行代码的艰巨任务。
When command parsing has done its job and command registration has been resolved, command execution does the hard work of running the code.