科研之友
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<正>China’s space lab Tiangong 2 successfully de-orbited and reentered the atmosphere in a controlled manner on July 19 after operating 1,036 days in space. A small amount of debris fell into a preset safety area in the South Pacific Ocean."TheTiangong2spacelabnotonlyhascarriedoutall plannedandextensiontasksperfectly,ithasfinallydrawntoa
