这样，在一定人数内，新增一个消费者的边际成本基本为零，但是当使用者达到一定人数后，新增一个消费者的边际成本将非常明显。
That is, the marginal cost of an additional user is essentially zero for a sizeable number of users, but then marginal cost grows rapidly in the number of users.
新增新的功能，让使用者可以依据国旗外观形状去查询国家。
Add a new function. Allows users can based on flags shape to query the country.
欲新增监看频道项目，请将监看频道自所有监看频道资料夹中拖曳至使用者自订资料夹。
To create a channel represtative in user-created folder, drag a channel from folder All channels to the destined folder.
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