Tree WiFi is a simple way for people to know about the air pollution around them.
通过树木无线网这种简单的方式，人们可以了解到周围的空气污染情况。
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If you don't know your wayaround, don't know how to protect yourself from pickpockets, or make silly assumptions about how safe your money is, you can become an easy target.
It's not immediately clear who was meant to read these labels, whether they're aimed at the gods of the afterlife or perhaps the servants that might not know their wayaround.