航天飞机是工程学历史上值得记载的一笔。它是唯一可以飞入太空而后安然返回地球的航天器。航天飞机上可回收的部分叫做轨道舱。当轨道舱绑上橙色的燃料罐和两个火箭推进器以后,整个航天飞机的重量达到2200吨。要用地面上最大型的运输工具才能把它们运送到佛罗里达州的卡纳维拉尔角的发射架前。平均一次航天计划会持续大概十天。在这段时间里,轨道舱会沿地球轨道飞行160多圈。 The shuttle is a well-documented work in engineering history. It is the only spacecraft that can fly into space and then safely return to Earth. Recyclable part of the space shuttle called the orbital module. When the orbital module was tied to the orange fuel tank and two rocket propulsion, the entire space shuttle weighed 2,200 tons. Transport them to the launch pad at Cape Canaveral, Florida, with the largest means of transport on the ground. The average space program will last about ten days. During this time, the orbital module will fly over 160 orbits of Earth’s orbit.