| 释义 |
ˈretro-engine Astronautics.
Also as one word.
[f. retro- + engine n.]
= retro-rocket b.
1967Britannica Bk. of Year 804/1 Retro-engine, retro-rocket. 1971New Scientist 6 May 305 Each Mariner..carries to Mars..about 1000 lbs of fuel for the 14-minute retroengine burn needed to slow it to the requisite orbital speed. 1977Sci. Amer. Nov. 52/1 With the help of its retroengines and parachute it dropped to the surface of Mars. |