2023 年 11 月 23 日，位于美国华盛顿州汉福德和路易斯安那州利文斯顿的激光干涉引力波天文台（ LIGO，Laser Interferometer Gravitational-wave ...

KUNMING, July 18 (Xinhua) -- As the heat wave rolls in, where can one find a cool retreat that also offers the charm of borderland culture and the joy of leisurely sightseeing? Southwest China's ...