The Salk vaccine is a major factor in the fight to eradicate polio.
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暂无解析
Despitetheproliferationofotherfastermodesoftransportation,therailroadsremainthelargestcarriersofintercityfreightintheUnitedStates.
The Salk vaccine is a major factor in the fight to eradicate polio.
Theflowerbudofawaterlily百合opensatsunsetsince.itsopeningistriggered(commence).bythedecreasedlight.
Blue－greenalgaegrowabundantlyinsaltmarshes.
MaryMcCarthyssatires讽刺文学arecouchedinaprosestylethathasaclassicprecision.
