一年后，在瑞典再次捕获了其中的3只，获得了追踪数据。

Tracking data for three of the birds was retrieved after their recapture in Sweden a year later.

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注意 WebRowSet 是如何追踪数据中的新旧值的。

Notice how the WebRowSet keeps track of the previous values as well as the new values of our data.

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因此，您可以从追踪数据中排除出它们，以提高收集以及网络交通的性能。

Therefore, you can exclude them from tracing data to improve performance of collection and network traffic.

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