dead end;dead-end是什么意思

用法例句

The paper reported 6 species of Basidiomycetes that had not been recorded in Jilin province They are Laccaria tortilis (Bolt) S FGray, Marasmius maximus Hongo,Protodaedalea hispida Imazeki,Poronidulus conchifer (Schw) Murr , Lysurus sinensis Lioyd and Geastrum saccatum (Fr) Fisch Among them, Protodaedalea Imazeki and Poronidulus Murr are new to Jilin province

报道了吉林省新分布担子菌6种,即刺孢蜡蘑Laccariatortilis(Bolt )S F Gray,大型皮伞MarasmiusmaximusHongo,粗毛原迷孔菌ProtodaedaleahispidaImazeki,巢孔菌Poronidulusconchifer(Schw )Murr 中华散尾菌LysurussinensisLioyd和袋形地星Geastrumsaccatum(Fr )Fisch 。