The release said an interstage ring is a key component in a multistage rocket, and that those used on China's current rockets were made in sections before being assembled.

发布会表示，级间环是多级火箭的关键组成部分，而用在中国现有火箭上的级间环以往都是分开制造，最后组装的。

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Once in flight, the plane will disengage from its capsule and return to the ground, while the capsule launches multistage booster rockets to propel it into space orbit or to the International Space Station.

BBC: The futurist: The world��s largest plane