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