约以30个词概括短文内容China on Thursday successfully launched a three-

约以30个词概括短文内容
China on Thursday successfully launched a three-man crew into space where one of them will make the country's first spacewalk,the country's most challenging space mission since first launching a person into space in 2003.The mission,expected to last three to four days,is devoted almost entirely to the execution of the spacewalk,known formally as an extra-vehicular activity,or EVA,is expected to help China master the technology for docking two orbiters to create China's first orbiting space station in the next few years.
The two astronauts who don spacesuits for the Shengzhou 7 spacewalk will be supported by Russian experts throughout the mission.Only one will actually leave the orbiter module to retrieve scientific experiments placed outside.One of the astronauts will wear China's homemade Feitian suit,while the other will wear a Russian-made suit.Fighter pilot Zhai Zhigang,an unsuccessful candidate for the previous two manned missions,has been touted by the official Xinhua News Agency as the leading astronaut to carry out the spacewalk,expected to last about 40 minutes.
"The Shenzhou 7 mission marks a historic breakthrough in China's manned space program," Zhai said."It is a great honor for all three of us to fly the mission,and we are fully prepared for the challenge."