在大多数情况下，小孩是外部对象。
外部对象不支持集合类型属性。
External objects do not support the collection type property.
这可以通过外部值和内部对象字段来实现。
This is done with external values and internal object fields.
相反，使用对象外部的内容可以提供正确的实现。
Instead, use something external to your object to give you the correct implementation.
也就是说，它必须初始化某对象并使该对象从外部可以利用。
In other words, it must initialize and make externally available an object model for it.
曲面建模法精确定义了要建模对象的外部结构。
Surface modeling defines precisely the outside of the object being modeled.
曲面建模法精确定义了要建模对象的外部结构。
Surface modeling defines precisely the outside of the object being modeled.
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