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二段式宇宙輸送機
Wikipedia definition
1. Two-stage-to-orbitA two-stage-to-orbit (TSTO or DSTO - Double/Dual-Stage-To-Orbit) launch vehicle is a spacecraft in which two distinct stages provide propulsion consecutively in order to achieve orbital velocity. It is intermediate between a three-stage-to-orbit launcher and a hypothetical single-stage-to-orbit (SSTO) launcher. At liftoff the first stage is responsible for accelerating the vehicle. At some point the second stage detaches from the first stage and continues to orbit under its own power.
Read “Two-stage-to-orbit” on English Wikipedia
Read “二段式宇宙輸送機” on Japanese Wikipedia
Read “Two-stage-to-orbit” on DBpedia

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