Chen Dong, one of the two astronauts in the Tiangong-II, introduces the laser Doppler probe for cardiovascular research in the gravity-free environment, on October 30, 2016. (Photo/Xinhua)
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Chen Dong, one of the two astronauts in the Tiangong-II, introduces the laser Doppler probe for cardiovascular research in the gravity-free environment, on October 30, 2016. (Photo/Xinhua)
