To register the FunctionCall object, do the following.
若要注册FunctionCall对象，请执行以下步骤。
There is no need to implement all the functions defined in the FunctionCall interface.
没有必要实现FunctionCall接口中所定义的所有函数。
It also registers the FunctionCall object and each of the custom functions it supports.
该类还将注册FunctionCall对象以及它所支持的每个定制函数。
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