开展低成本运载火箭、新型上面级、天地往返可重复使用运输系统等技术研究。
China will conduct research into the technologies for low-cost launch vehicles, new upper stage and the reusable space transportation system between the earth and low-earth orbit.
CZ - 2c是适用于发射低轨道、质量较大卫星的二级液体运载火箭。
CZ-2C is a two-stage liquid propellant launch vehicle, which is suitable for launching heavier LEO satellite.
完成了有效载荷发送任务之后的运载火箭末级是最具有威胁性的空间碎片源。
The upper stage of a launch vehicle accomplishing its mission becomes a serious source of space debris.
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