当背景作业已完成、取消或引发例外状况时发生。
Occurs when the background operation has completed, has been canceled, or has raised an exception.
隐藏的背景作业程序，任务类型，计划你的生活将提供极大的便利。
The hidden background operating procedures, types of missions to plan your life will provide great convenience.
本课程包含编程作业，最好有一定程度的编程背景。
The course includes programming assignments and some programming background will be helpful.
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