发射环是一个设想中的非火箭航天发射装置。通过利用一个架在距地面80公里，长为2000公里的高架环路上的磁悬浮带，把负载发射到某个轨道上。整个带子在将负载抛射出地面后，向下，并反向向来的方向运动直到最初的发射端，这样构成一个环形回路。
带帽盖的发射环 button-type lug
场发射环境扫描电镜 field emission-environment scanning electron microscope ; FE-ESEM
发射环境扫描电镜 field emission-environment scanning electron microscope
环形发射极晶体管 ring emitter transistor ; ret
循环发射 Cycle Emission
环形发射天线 MAGNETIC LOOP
闭环发射分集 CLTD ; Close Loop Transmit Diversity ; closed transmit diversity
分组循环发射 grouped-cycling sending
计算结果表明，若发射环月卫星，必须进行多次中途轨道修正。
The computing result indicates that multiple midway trajectory correction should be done while a circumlunar satellite is being launched.
今年晚些时候，中国有可能发射一个无人环月航天器，向最终实现中国太空人的登月目标前进了一步。
Itis possible that later this year China will launch an unmannedspacecraft to orbit the moon, a step towards an eventual moon landing by aChinese astronaut.
调查显示，挑战者号发射当日低温，导致火箭推进器上橡胶O行环密封圈失效，进而引起爆炸性气体泄露。
Theinvestigation showed that low temperatures on the day of the launch caused arubber “O-ring” seal on one of the rocket boosters to fail, which led to a leakof explosive gases.
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