Despitetheproliferationofotherfastermodesoftransportation,therailroadsremainthelargestcarriersofintercityfreightintheUnitedStates.

Thefirstpaperwasmadefromthebarkofthemulberrytree.

HowmanypeopleareawarethatadancerwiththeNewYorkCityBallettypicallywearsoutaminimumoftwohundredpairsoftoeshoesperyear?

InthenortheasternUnitedStates,itrainsintermittently间歇地throughoutthespring.

ThefuturesurvivalofthebaldeagleisstillanimportantAmericanecologicalconcern.