This is a panorama of the topology of simply-connected smooth manifolds of dimension four. Dimension four is unlike any other dimension; it is large enough to have room for wild things to happen, but too small to have room to undo them. For example, only manifolds of dimension four can exhibit infinitely many distinct smooth structures. Indeed, their topology remains the least ...(展开全部)

This is a panorama of the topology of simply-connected smooth manifolds of dimension four. Dimension four is unlike any other dimension; it is large enough to have room for wild things to happen, but too small to have room to undo them. For example, only manifolds of dimension four can exhibit infinitely many distinct smooth structures. Indeed, their topology remains the least ...(展开全部)

From the rabbit-sized Black-footed Cat of southern Africa to bear-killing Amur tigers of the Russian Far East, the 38 members of the Cat Family include some of the world's most fascinating and magnificent species on earth. Supremely adapted for the kill, all cats are obligate carnivores; they survive only by preying upon other animals, and they have become one of evolution's mo...(展开全部)

Ranging from the largest – the Tiger to the smallest species – the Rusty-Spotted Cat and Black-Footed Cat, the world's wild cats are some of the most beautiful, ferocious and feared carnivores in the world. Wild Cats of the World provides a detailed account of each species of wild cat, examining their importance throughout history and the future of some of the most endangered b...(展开全部)

Did you know that European royalty once used cheetahs to hunt deer, or that caracals can capture birds by leaping six and a half feet straight up into the air from a standing start? Have you ever wondered whether domestic cats really do land on their feet when they fall, or how Canada lynx can stalk their prey in the winter without falling through the deep snow? "Wild Cats of t...(展开全部)

本书为公版书，为不受著作权法限制的作家、艺术家及其它人士发布的作品，供广大读者阅读交流。汇聚授权电子版权。

The Call of the Wild is a novel by Jack London published in 1903. The story is set in the Yukon during the 1890s Klondike Gold Rush—a period when strong sled dogs were in high demand. The novel's central character is a dog named Buck, a domesticated dog living at a ranch in the Santa Clara Valley of California as the story opens. Stolen from his home and sold into service as sled dog in Alaska, he reverts to a wild state. Buck is forced to fight in order to dominate other dogs in a harsh climate. Eventually he sheds the veneer of civilization, relying on primordial instincts and learned experience to emerge as a leader in the wild.

加里·斯奈德 Gary Snyder，20世纪美国著名诗人、散文家、翻译家、禅宗信徒、环保主义者。他是“垮掉派”诗人中至今创作成就最大的一位，曾出版诗集、散文集和访谈录等二十多本著作，多次获得重要奖项，包括美国国家图书奖、博林根诗歌奖、莱文森奖、古根海 姆基金奖及普利策诗歌奖等。他深受中国古代文化的影响，喜欢沉浸于自然，将历史与荒野纳于心中。在大自然中的生活和思考使他的作品更接近事物的本色以对抗我们时代的失衡与无知。 译者 陈登，哲学博士。出版英语方面的著作多种。谭琼琳，教授，博士生导师，英国威尔士大学英语语言文学博士，英国皇家亚洲研究会会员，英国威尔士大学荣誉研究员。斯奈德研究专家，出版研究斯奈德的英语专著一部，并发表相关论文十余篇。