| 单词 | retrorocket |
| 释义 | retrorocket (once / 110461 pages) n WORD FAMILY retrorocket: retrorockets USAGE EXAMPLESCloser landings risk damage to sites of historical importance, from the blast of a retrorocket or a collision. Science Magazine(Dec 22, 2016) In the past, getting hardware to Mars has required complex engineering, using a combination of heat shields, retrorockets, parachutes, and more. The Verge(Apr 29, 2016) There’s a small crater nearby where the capsule’s retrorockets fired to slow its descent at the last minute. National Geographic(Mar 04, 2016) n a small rocket engine on a larger rocket or spacecraft that is fired to slow or alter its course Hyper rocket, rocket engine a jet engine containing its own propellant and driven by reaction propulsion |
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