三级午夜理伦三级老熟人,日日操夜夜操免费视频,亚洲精品国产精品色诱一区,国产在线黄色,人人干天天射,日韩精品在线视频播放,亚洲日韩视频免费观看

Xinhua pictures of the year 2018

Source: Xinhua| 2019-01-05 16:57:04|Editor: Liangyu
Video PlayerClose

XINHUA-PICTURES OF THE YEAR 2018

Researchers check the surface of a four-meter-aperture optical mirror developed by Changchun Institute of Optics, Fine Mechanics, and Physics of the Chinese Academy of Sciences in Changchun, northeast China's Jilin Province, Aug. 21, 2018. China has developed a high accuracy four-meter-aperture optical mirror, an important tool for deep space and astronomical observation. (Xinhua/Xu Chang)

KEY WORDS: China
EXPLORE XINHUANET
010020070750000000000000011100001377218131