The first paper was made from the bark of the mulberry tree.
A、driedwoodB
暂无解析
InthenortheasternUnitedStates,itrainsintermittently间歇地throughoutthespring.
ThefirstimportantexpositionintheUnitedStateswasheldinPhiladelphiain1876.
Thefirstpaperwasmadefromthebarkofthemulberrytree.
Thecontrolsofmostmodernairplanescanbeoperatedeithermanuallyorautomatically.
Someseaurchins海胆havevenomous(toxin)spines
