12 年前
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子弹经过两百年的科学研究，从一个简单的铅球，变成性能极佳的弹药。科学新发现将介绍子弹的科学，以及子弹如何凭科技的进步，演化为现在的弹药。。The third season of Saturday Night Live, an American sketch comedy series, originally aired in the United States on NBC between September 24, 1977, and May 20, 1978. The season is also notable for the contest, Anyone Can Host. During the start of the season the show advertised the contest for a non-celebrity to host the show.[citation needed] The winner was 80 year-old grandmot...。本片用IMAX高超的摄影科技，介绍热带雨林40亿年来生命系统的发展过程，用最精彩的音效和摄影记录了雨林生态。从生活在森林顶端的鸟类与灵长类动物到雨林底部的昆虫，都有完整的呈现，同时也探讨了雨林快速消失的原因。。
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