革命圣地陕西延安迎高铁，如何抓住新机遇？记者踏上高铁列车，从西安赶赴陕北，探寻答案。
Фото: Athit Perawongmetha / Reuters
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This winter's extreme flooding has destroyed nests, drowned small mammals and threatens a sharp drop in butterflies and other species this spring.
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