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　　三年前的 8 月 31 日，突如其来的“侵略者”，—艘巨大的“母舰”降落至东京上空，世界似乎迎来了终结……在那之后，绝望融入了日常生活，巨大的圆盘飘浮在上空的世界持续到现在。小山门出、中川凰兰两个高中少女，在这个走向终结的世界中，挥洒着自己的青春时代。

 20世纪70年代初的北京，忙着“闹革命”大人无空理会小孩，加上学校停课无事可做，以军队大院男孩为突出代表的少年人便自找乐子，靠起哄、打架、闹事、拍婆子等方式挥霍过量的荷尔蒙。马小军（夏雨 饰）就是这样的少年，他的嗜好之一是趁别人家无人用万能钥匙将其锁打开，溜进去耍玩一番，正是用这样的方式，少女米兰（宁静 饰）的照片先于其人入了马小军的双眼。通过院里的“头儿”刘忆苦（耿乐 饰），马小军又见到之前在炮局偶然瞥见过一眼的米兰，开始正式将其当作梦中情人，然而在米兰眼中，马小军不过是毛孩一个，她中意的人是成熟、稳重、帅气的刘忆苦。自此，马小军迎来五味混杂的青春期生活。本片改编自王朔短篇小说《动物凶猛》。夏雨凭此片获得第51届威尼斯国际电影节最佳男演员（银狮奖）。

　　The boisterous, arrogant professor Challenger, a reputed biologist and anthropologist, dares the London Zoological Society to mount an expedition to verify his spectacular claim, without physical proof, that his previous expedition to the Amazonian basin found live dinosaurs. Apart from him and his 'socialite' counterpart, professor Summerlee, it consists of experienced discoverer Lord Roxbury, the young reporter Ed Malone -who got publicly struck down with Challenger's umbrella at his arrival- and Jennifer Holmes, Malone's news agency's boss's daughter, essentially as conditions for putting up the money. In Brazil they are joined by Jennifer's brother David and local 'guide' Manuel Gomez. They soon discover the dinosaurs are real and dangerous, like giant spiders, but loose their helicopter and thus are desperate for a way down from the isolated plateau. They learn Roxbury knew about the fate of Burton White, an explorer whose diary they find, thus presume to be dead, in search of diamonds, and confirmation of the local tribe being the lethal guardians of the plateau's secrets, but also get surprising help...