中文幕亚洲精品乱码色偷偷亚_国产午夜性爽视频男人的天堂_欧美高潮流白浆喷水在线观看_亚洲夜色久一久二亚洲琪琪卡一卡二_暖暖亚洲一区二区三区AV无码

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