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Can DNA of 800-year-old oak help save future forests? 八百岁古橡树的 DNA 能帮助 ...

Cyclists make Olympic history, 400-year-old shark 英国自行车运动员创英奥运历史，400岁格陵兰鲨鱼 Episode 160818 / 18 Aug 2016 Learn English words and phrases from this story ...