每个源操作符都会被分配一个相关的名称，在画布中，这个名称也反映在操作符的标题中。
Each source operator is given a relevant name that is also reflected in the caption of operator in the canvas.
在内核中，会为有限的对象集(例如文件描述符和其他常见结构)分配大量内存。
Within a kernel, a considerable amount of memory is allocated for a finite set of objects such as file descriptors and other common structures.
如果该属性的值为true，那么将machine实例的一个引用分配给machine标识符。
If this evaluates to true, then a reference to the machine instance is assigned to the machine identifier.
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