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China's Shenzhou 13 astronauts have presented a science lesson live from the orbiting Tiangong space station on Thursday.
Astronauts Zhai Zhigang, Wang Yaping and Ye Guangfu began the class at 2:40 am EST (0740 GMT, 3:40 pm Beijing time) on Thursday from inside the Tianhe module, the core of the Tiangong station.
The class featured topics including life and work aboard the Tianhe space station module, the behavior of biological cells, how astronauts move in microgravity, water surface tension experiments and more, according to CMSA, China's human spaceflight agency.
生词短语：
astronaut
航天员；宇航员
present
呈现
live
直播地
orbit
环绕…飞行
module
模块
biological cell
生物细胞
microgravity
微重力
tension
张力
CMSA/China Manned Space Agency
中国载人航天工程办公室
