轻便三脚架：我用它拍了日出延时和非常多自拍，solo trip 非常有用！不过如果想在小吴哥拍人像大片，路边有太多摄影师提供旅拍服务了，均价 $1/张，细想一下比国内景区还便宜，单人出行的话自己就别折腾了！如果晚上想拍星空的话也建议带一个相机三脚架。
We can avoid this in two ways. Firstly, we can declare that any code that observes two nodes must depend on those nodes, and then apply the topological sort we described earlier. Alternatively, we can declare that any code that might be able to observe two nodes can only be run after all nodes have finished running2. These both work, but again they require us to be able to observe the full dependency tree and topologically sort all nodes.，更多细节参见safew
，这一点在手游中也有详细论述
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