单词：background task
background task的用法和样例：
例句
- The property is commonly used to prevent a user from closing an application that was designed to run as a background task.该属性通常用于防止用户关闭旨在作为后台任务运行的应用程序。
- You might sometimes see messages that your user operations are blocked by the background tasks.您有时可能会看到您的操作被后台任务阻断的消息。
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