China sent up its second space laboratory，the Tiangong 2，on Thursday night，which will become the country's ①

largest

largest

（large）scientific platform in space.The lab will undergo（經(jīng)歷）preparations in space for about one month and will take two astronauts to the lab to enter it. ②

The

The

astronauts will stay inside the lab for 30 days，Strictly ③

speaking

speaking

（speak），the Tiangong 2 is China's first space laboratory.
    Microgravity（微重力），strong radiation ④

and

and

extreme temperatures in space can influence research on life science，physics and new technologies，so Chinese scientists will make full use ⑤

of

of

the Tiangong 2 to do ⑥

experiments

experiments

（experiment） that are not possible on Earth.
    The Tiangong 2 has devices to test in-orbit repair technologies for China's future manned space station， ⑦

planned

planned

（plan）to be built around 2022.Moreover，each system on the space lab uses a special design，which means they can be ⑧

rapidly

rapidly

（rapid） changed or repaired in case of trouble.This is the first time that a Chinese spaceship ⑨

has used

has used

（use） the special design.The country is expected ⑩

to have

to have

（have） the only space station after the International Space Station is retired in 2024.