InthenortheasternUnitedStates,itrainsintermittently间歇地throughoutthespring.
Despitetheproliferationofotherfastermodesoftransportation,therailroadsremainthelargestcarriersofintercityfreightintheUnitedStates.
Thefirstpaperwasmadefromthebarkofthemulberrytree.
Someseaurchins海胆havevenomous(toxin)spines
Anoversight遗漏(miss,overslaugh)inproofreadingoftenresultsinprintederrors.
Thecontrolsofmostmodernairplanescanbeoperatedeithermanuallyorautomatically.