We do not care about the nature of object and arrows; all we need are the following properties.
我们不关心object和arrow的本质我们需要的只是下边这些属性。
Next you need to add these shapes. I have made them using the Line Tool (u) and the arrows I took from the Custom shape Tool.
下面你需要增加这些形状，我已经使用线工具(U)创建了它们，那些箭头我是从自定义形状工具里拿来用的。
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