Instantiate the XMLHttpRequest (XHR) object variable.
实例化XMLHttpRequest (xhr)对象变量。
This PHP code reads the XML data from Listing 1 into an object variable.
这个PHP代码将XML数据从清单1读取到一个object变量中。
The OleControlSite object variable handles the interaction with the ActiveX control.
OleControlSite对象变量处理与ActiveX 控件的交互。
Therefore, you must first assign a new business object instance to a business object variable before using it.
因此，在使用业务对象变量前，必须首先将新的业务对象实例赋值给它。
The fact that an object variable can refer to multiple actual types is called polymorphism.
一个对象变量实际上能指向多种类型就是多态。
Declare the object variable to be of the type of the object you intend to assign to the variable.
将对象变量声明为要分配给该变量的对象类型。
But classes are reference types, and an object variable can refer to various class instances at different times.
而类是引用类型，对象变量可在不同的时间引用各种类实例。
When you assign one object variable to another, or pass an object variable to a procedure, only the reference pointer is copied.
当将一个对象变量赋给另一个，或传递一个对象变量到过程，仅有引用指针被复制。
An object variable can have different class instances assigned to it at different times, and several object variables can refer to the same class instance at the same time.
一个对象变量可以有在不同时间赋给它的不同的类实例，多个对象变量可以同时引用同一个类实例。
Cold rolling technology is applied to ring parts extensively. In the process of numerical simulation and optimization of cold rolling, roundness is a key object variable of the design.
冷辗工艺广泛应用于环件的加工，在冷辗环数值模拟与优化过程中，圆度是重要的目标设计变量。
Cold rolling technology is applied to ring parts extensively. In the process of numerical simulation and optimization of cold rolling, roundness is a key object variable of the design.
冷辗工艺广泛应用于环件的加工，在冷辗环数值模拟与优化过程中，圆度是重要的目标设计变量。
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