【點直播】中國空間站「天宮課堂」 第四課｜9月21日
Synopsis
「天宮課堂」第四課今日（21日）開課，神舟十六號太空人景海鵬、朱楊柱、桂海潮將面向全國青少年進行太空科普授課。 本次太空 ...
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