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geo and nature 1

屁与健康 1

father's importance 0

沙漠里的奇怪现象 0

“金字塔能”的真相 0

千姿百态的鸟巢 0

Do animals have rights? 0

Two main techniques have been used for training elephants 0

逃命的藏羚羊 0

蝉的禅－蝉的生命周期质数之谜 0