ret·ro·rock·et 
(rĕtrō-rŏk′ĭt)
(rĕtrō-rŏk′ĭt)n.
A rocket engine used to retard, arrest, or reverse the motion of a vehicle, such as an aircraft, missile, or spacecraft.
| 单词 | retrorocket |
| 释义 | ret·ro·rock·et (rĕtrō-rŏk′ĭt)n. A rocket engine used to retard, arrest, or reverse the motion of a vehicle, such as an aircraft, missile, or spacecraft. |
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