我开始以为又是雾霾，没意识到是沙尘暴，只是看到有口罩的戴着口罩，没口罩的就用手捂着嘴跑，还在心中惊讶，北京什么时候出门得随手准备口罩啦?时间回驻地尚早，于是就紧走几步，顺着一条幽静的甬道拐进国图旁边的紫竹院公园。
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