一日离轨关,使返回舱脱离运行轨道,朝地球方向的弹道飞行;二日再入关,返回舱再入大气层,利用巨大的空气阻力制动减速,直至降到亚音速;三日开伞关,返回舱下降到低空后,打开降落伞,进一步减小下降速度;四日着陆关,着地之前,启动缓冲装置,减缓返回舱与地面的撞击,实现软着陆。 On the 1st derailment, the return capsule from the orbit, toward the direction of the Earth’s ballistic flight; re-entry on the 2nd, the return capsule into the atmosphere, the use of huge air resistance brake deceleration, until it fell to subsonic; three open After the parachute is closed and the return capsule is lowered to a low altitude, the parachute is opened to further reduce the descent speed. Prior to the landing and landing on the 4th, a buffer device is activated to slow the collision between the return capsule and the ground and achieve a soft landing.