对于业余博物学者来说,在一片空地上或被炸后的废墟里可能发现种类繁多的植物群和动物群。A vacant lot or a bombsite can, to the amateur naturalist, produce an extraordinary variety of flora and fauna.通过观察某些现存的动物群和植物群,我们就能更清楚地了解这种困难了.We shall appreciate this difficult...
Then the Berger - Be � � ery � � s upper bound on the trellis complexity for nonlinear codes is also derived.然后推出了非线性码的BergerBe′ery上界.Each courtyard had a grape trellis.家家户户的院子里,也都盖满了葡萄.Somewhat less strength is needed h...