文档介绍：雅思口语spacetravel雅思口语素材：space
雅思口语素材一：
Spacetravelisaformoftravelinwhichpassengersenterspace,,atapointcalledtheKarmanLine,anditcontinuesforadistancethatappearstobeinfinite,interruptedperiodicallybycelestialbodiessuchasstars,planets,,withpeopleconsideringspacethefinalfrontier,,trackingthemovementsofstars,planets,comets,,thefascinationwithspacetookonawholenewlevelofexcitementwhenhumanssuccessfullylaunchedmannedspacecraftoutoftheEarthsatmosphere,,theconceptofspacetravelbegantoseemlesslikeapipedreamandmorelikeareality,andprivatecompaniesbegantoenterthefield,,travelinspacewasrestrictedtoastronautswhoworkedforvariousgovernments,,maintainspacetelescopessuchastheHubbleTelescope,andeventuallytoperformresearchontheInternationalSpaceStation,