本发明避免了用户已使用流量超过用户当前套餐总流量，以免产生不必要的额外流量费用。

The present invention avoids the use of traffic exceeds the user has the total package current flow, in order to avoid unnecessary additional traffic charges.

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如果从D向外流动，流量就是正的。

This flux is counted positively if we go out of D.

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实际上南部支流外流了更多格陵兰岛中心冰原的水源，所以那边的冰川消退会导致更大规模的冰流量。

The southern tributary actually drains a larger portion of Greenland's central ice sheet, so a retreat there could lead to a more substantial ice discharge.

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