Just like an admin command, a task command should provide constructors to create and load commands.

就像管理命令一样，任务命令应该为创建和加载命令提供构造器。

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A task command has zero or more parameters and zero or more steps.

任务命令拥有零个或多个参数和零个或多个步骤。

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The constructor to create a step takes its parent task command and step metadata as input parameters.

创建步骤的构造器将其父任务命令和步骤元数据作为输入参数。

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