This is implied by the dotted arrow in the figure.
这由图中的虚线箭头表示。
In the diagram, a thick blue arrow stands for page transition, a black arrow stands for card invocation, and an orange dotted arrow stands for field reference.
在图中,蓝色的宽箭头表示页面转换,黑色箭头表示卡片调用,而桔红色虚线箭头则表示字段引用。
As shown in Figure 10, a dotted line with a closed, unfilled arrow means realization (or implementation); as we saw in Figure 4, a solid arrow line with a closed, unfilled arrow means inheritance.
如图10所示,一条带有闭合的单向箭头的点线意味着实现(或实施);正如我们在图4中所见到的,一条带有闭合单向箭头的实线表示继承。
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