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一片树叶,一滴水,还有空气,现在似乎不足为奇,但在500年后,这些东西都可能成为稀世珍宝。今天,我们随着张老师一起穿越时空,来到
A leaf, a drop of water, and air, now seem not surprising, but in 500 years, these things may become rare treasures. Today, we come across with time and space together with Teacher Zhang