党的十九大代表、人民网总裁牛一兵中国吉林网宣讲十九大精神

百度 在一家数学培训机构的家长群里，一张落款为全国华罗庚金杯少年数学邀请赛组织委员会的通知图片被分享。

Attendees watch an astronomical science popularization video during the first edition of Citizen Science Summit in Astronomy in Dalian, northeast China's Liaoning Province, July 31, 2025. The event was held here on Thursday, aiming to promote the popularization and public participation of astronomy. (Xinhua/Pan Yulong)

This photo taken on July 31, 2025 shows the opening ceremony of the first edition of Citizen Science Summit in Astronomy in Dalian, northeast China's Liaoning Province. The event was held here on Thursday, aiming to promote the popularization and public participation of astronomy. (Xinhua/Pan Yulong)

This photo taken on July 31, 2025 shows an astronomical photographic equipment during the first edition of Citizen Science Summit in Astronomy in Dalian, northeast China's Liaoning Province. The event was held here on Thursday, aiming to promote the popularization and public participation of astronomy. (Xinhua/Pan Yulong)

Attendees listen to a report during the first edition of Citizen Science Summit in Astronomy in Dalian, northeast China's Liaoning Province, July 31, 2025. The event was held here on Thursday, aiming to promote the popularization and public participation of astronomy. (Xinhua/Pan Yulong)

A staff member presents photos taken with astronomical cameras during the first edition of Citizen Science Summit in Astronomy in Dalian, northeast China's Liaoning Province, July 31, 2025. The event was held here on Thursday, aiming to promote the popularization and public participation of astronomy. (Xinhua/Pan Yulong)