这行程序可以正确编译运行，因为这是隐式类型转换。
The previous line of code compiles and executes correctly because there is an implied cast.
不同的表中相似的列应该声明为相同的类型，这样就可以不使用 Oracle 的隐式类型转换。
Similar columns in different tables should be declared with same data types, so that the implicit type-casting facility of Oracle is not used.
隐式转换操作符将 Point 类型转换为 int。
The implicit conversion operator is defined, which converts a Point type to int.
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