It is about the assembly and testing of an environmental control and regenerative life support system inside the Wentian lab module, according to China Manned Space Agency (CMS).

据中国载人航天工程办公室（CMS）称，这是关于在问天实验室舱内组装和测试再生式环控生保系统。

The Shenzhou-12 crewed spacecraft is scheduled for launch in June, sending three astronauts into orbit for about three months, during which the regenerative life support system and maintenance will be tested.

神舟十二号载人飞船定于6月发射，将3名航天员送入轨道约三个月，期间将对再生生命支持系统和维护进行测试。