And with that, you have polymorphic invoice and manifest functions that can be called on either an Order or a Contract and that will do the right thing.

就这样，您具有多态invoice和manifest函数，可以在一个Order或一个Contract上调用且作出正确操作。

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Once the instance is constructed, you can call the invoice and manifest functions on your PurchaseOrder object, which uses the implementations provided in the defrecord.

一旦构造了实例，您就可以在您的 PurchaseOrder 对象上调用 invoice 和 manifest 函数，其使用在 defrecord 中提供的实现。

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Land aesthetic social functions manifest the sociological meanings of the land aesthetics.

土地审美功能凸显了土地美学的社会学意义。

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