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1983年8月10日,我在北京主要街道上,突然发现不少头顶黄帽,身披绿衣的信筒,引起了我的好奇,便跟踪考察这些“不速之客”并作了
On August 10, 1983, on the main street in Beijing, I suddenly found a lot of yellow caps and green-colored letterboxes on my head. It aroused my curiosity and followed up and inspected these “uninvited guests.”