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。
Click and drag the incoming arrow from the element to an empty diagram location.
点击引入的箭头，从元素拖拽到一个空图位置。
The double-lined arrow in the diagram is an alternative notation that shows a unit being hosted on another unit.
图表中的双行箭头是一种提示：寄主于另一个单元上的单元。
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