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问题：用英语介绍重力的物理知识两分钟的演讲
答案：↓↓↓ 马新民的回答： 网友采纳 Gravitation,orgravity,isanaturalphenomenonbywhichphysicalbodiesattractwithaforceproportionaltotheirmass.Gravitationismostfamiliarastheagentthatgivesweighttoobjectswithmassandcausesthemtofalltothegroundwhendropped.Gravitationcausesdispersedmattertocoalesce,andcoalescedmattertoremainintact,thusaccountingfortheexistenceoftheEarth,theSun,andmostofthemacroscopicobjectsintheuniverse. GravitationisresponsibleforkeepingtheEarthandtheotherplanetsintheirorbitsaroundtheSun;forkeepingtheMooninitsorbitaroundtheEarth;fortheformationoftides;fornaturalconvection,bywhichfluidflowoccursundertheinfluenceofadensitygradientandgravity;forheatingtheinteriorsofformingstarsandplanetstoveryhightemperatures;andforvariousotherphenomenaobservedonEarth. Gravitationisoneofthefourfundamentalinteractionsofnature,alongwithelectromagnetism,andthenuclearstrongforceandweakforce.ModernphysicsdescribesgravitationusingthegeneraltheoryofrelativitybyEinstein,inwhichitisaconsequenceofthecurvatureofspacetimegoverningthemotionofinertialobjects.ThesimplerNewton'slawofuniversalgravitationprovidesanaccurateapproximationformostphysicalsituations. | 
