然而，与应用程序上下文中的其他后端调用相比，提取这些数据是一项高开销的任务，需要大量的时间。
However, fetching this data is an expensive task, and takes a huge amount of time compared to other back-end calls in your application context.
Magnus web应用程序呈现了这种可能性的一小部分：它提取并呈现与地理坐标、时间和用户帐户相关的数据。
The Magnus web app takes on a rather small slice of this potential: it pulls and presents data related to geographic coordinates, times, and user accounts.
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