background task的用法和樣例：
例句
- The property is commonly used to prevent a user from closing an application that was designed to run as a background task.
該屬性通常用於防止用戶關閉旨在作為後台任務運行的應用程序。 - You might sometimes see messages that your user operations are blocked by the background tasks.
您有時可能會看到您的操作被後台任務阻斷的消息。
