Data object being navigated or modified are not as obvious as they would be with a user-defined object wrapper.

导航或修改的数据对象不如使用用户定义的对象包装器时那么明显。

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Figure 2 illustrates a more robust alternative that relies on an application-defined object model to isolate the code that deals with XML in a Serialization package.

图2示范了一种更健壮的替代方案，它依靠应用程序定义的对象模型，将处理XML的代码隔离在Serialization包中。

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Gets a user-defined object that qualifies or contains information about an asynchronous operation.

获取用户定义的对象，它限定或包含关于异步操作的信息。

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the zeroth law, which is the common-sense law, which says that if you take a hot object next to a cold object, heat will flow from the hot to the cold in a way that is well defined, and it allows you to define temperature.

上节课我们讨论了，热力学第零定律,这一定律源自常识：如果把一个热的物体,与一个冷的物体挨在一起，热量就会以确定的方式。

麻省理工公开课 - 热力学与动力学课程节选

When objects are described with mathematically defined curves, however, the computer can decide how many polygons to draw, depending on how far away the object is meant to be.

ECONOMIST: Smooth operator | The