Solidgeometryhasenabledastronomerstocalculatethepositionsoftheheavenlybodiesrelativetooneanother.
A、ontopofSomeseaurchins海胆havevenomous(toxin)spines
AlthoughtheCarbon14methodofdatingoldobjectsisnotfoolproof,itisthebestmethodavailableatpresent
Communicationisoneofthemostimportantbondsthatholdculturalsystemstogether.
Despitetheproliferationofotherfastermodesoftransportation,therailroadsremainthelargestcarriersofintercityfreightintheUnitedStates.
MaryMcCarthyssatires讽刺文学arecouchedinaprosestylethathasaclassicprecision.
