the international space station

1、TheInternationalSpaceStation國際空間站是在國際合作基礎上建造的最大載人空間站，為人類進行科學研究和天文觀測提供了技術保障。TheInternationalSpaceStation(ISS)willbealittle“cityinspace”biting(沿軌道運轉)250milesabovetheearth.Aboutthesizeoftwofootballfieldsthespacestationwillb

2、eaplacewherepeoplefromaroundthewldcanlivestudyinspaceoverlongperiodsoftime.TheISSisanextremelyexpensiveprojectbutitwillsomedayserveasasteppingstoneffuturespaceexplation.Sixteencountriesfromaroundthewldarewkingtogetheront

3、heInternationalSpaceStation.TheseinternationalpartnersaretheUnitedStatesRussiaCanadaJapanBrazilEuropeanSpaceAgency(BelgiumBritainDenmarkFranceGermanyItalytheherlsNwaySpainSwedenSwitzerl).Riskingthedangersofspacethesixtee

4、ncountriesarespendingbillionsofdollarsmanyyearsbuildingthespacestationbecausetheybelievetheycanbenefitalotfromit.Perhapsthemostimptantbenefitisthatthespacestationallowshumanstolivestudyflongperiodsinmicrogravity(微重力)a“we

5、ightless”environment.Thinkofthespacestationasasteppingstonetothestars.IfhumansareevergoingtotraveltootherplassuchasMarswemustundersttheeffectsofsuchlongjourneysonthehumanbody.We’velearnedfrompastspacetravelthatlivinginmi

6、crogravityleadstotheweakeningofbonesmuscles.Thespacestationwillallowscientiststoundersttheseeffectsstudypossiblesolutionsflongtermspacetravel.Butstudyinginmicrogravityisnottheonlyreasonfthespacestation.Fthefirsttimewewil