早期的橡胶是取自橡胶树、橡胶草等植物的胶乳，加工后制成的具有弹性、绝缘性、不透水和空气的材料。高弹性的高分子化合物。分为天然橡胶与合成橡胶二种。天然橡胶是从橡胶树、橡胶草等植物中提取胶质后加工制成；合成橡胶则由各种单体经聚合反应而得。橡胶制品广泛应用于工业或生活各方面。

This is the epic, untold story of how same-sex marriage became law of the land. Documenting one of t...

A documentary series that explores the furthest reaches of the internet and the people who frequent ...

　　The Cayman Islands. It is a Caribbean paradise of sun, sea and cocktails, but there is something else going on. Big money, big corporations... and seemingly no one paying a penny of tax.
　　Now Jacques Peretti travels to Cayman in search of the truth about this controversial British tax haven, and uncovers some shocking revelations for what this sun-drenched island means for everyone back in Britain.
　　Jacques meets the politicians, playboys and ex-pats on the islands in a bid to unravel the truth about a place with the population of Bognor Regis... but a trillion pounds in the bank!

　　A documentary about a jazz trumpeter and his wife.

　　High-profile beauty vlogger Em Ford was a victim of online abuse and fought back. Now she targets the alarming rise of online abuse in Britain by trying to track down the trolls responsible.

　　发现世界海洋里满是塑料垃圾后，这名纪录片导演调查了该污染对环境的恶劣影响。

An in-depth look at the prison system in the United States and how it reveals the nation's history o...

　　这部纪录片包含访谈、见解和档案影像，为我们揭示历史事件是如何塑造了约翰·克特兰的音乐。

本片讲述二战史学界不常提及的一段历史，教皇庇护十二世（Pope Pius XII）和纳粹德国到底关系如何。教皇对犹太人大屠杀保持沉默，但是否参与了对希特勒的刺杀？国家地理频道出品。

Isolated from the rest of the world since the time of the dinosaurs, New Zealand’s magnificent wildl...

Horizon is an ongoing and long-running British documentary television series on BBC that covers scie...

　　An investigative expose of the inner workings inside the commercial pet food industry, which has went largely unchallenged until now.

　　军械库系列片是一部介绍武器以及和武器相关的教学类纪录片，每一集讲述了一种武器，并讲述其使用方法，示范教学，当然还会介绍其保管方法。武器的分类:家庭防御武器和猎枪手枪，冲锋枪，步枪和卡宾枪，突击步枪，机关枪，冷兵器以及重型武器装备等。观众不仅可以看到对传说中的武器的详细解析，还会看到世界上最新的武器像雷明顿7600，AUG77，MKB-43，AK-47，布莱泽R93RLS2，VZOR-59，勃朗宁1900，马林·温彻斯特，SVD&ZigZauer SSG 3000，装甲车VA-20，VA-64B，坦克T-34等。

　　简介：英国是全世界学龄最低的国家之一。只要年满四岁，孩子就要进学校开始接受教育。要这些乳臭未干的宝宝们突然间离开父母温暖的怀抱，每天在学校里乖乖待上六个小时，他们真的能适应吗？父母们真的放心吗？老师们该怎么做才能安抚孩子们的情绪，让他们不再想家，快乐地投入到集体生活中去呢？虽然年纪小，但每个孩子都已经开始展露自己的个性，怎样因材施教，把他们培养成懂礼貌、有爱心的人呢？让我们来看看西约克郡一所普通小学开学后的第一周，一大波四岁的萌宝是怎么适应学校生活的。

二战前夕，温顿是伦敦的一个股票交易员，途经捷克时，温顿发现一大批被纳粹扣留的犹太儿童。他游说德国军方放过他们，并交给他运往英国，救助工作危险而艰辛，最终他动用各种关系，用8列火车救出了669个孩子，并...

　　Wide Open Sky是一部来自澳大利亚的纪录片，它记录了澳大利亚莫拉贝拉好声音合唱团的温馨故事。他们将从试镜到年终音乐会的历程记录下来，以展示给观众。在这里，体育是王道，音乐教育是不存在的。尽管如此，指挥家米歇尔对合唱团仍有很高的期望。她想教孩子们当代的，原创的，要求较高的音乐。Wide Open Sky是一个破坏性和美感并存的纪录片，是一个动人的童年可能性的动态呈现，并提醒我们为什么孩子们都应该成长在有音乐的环境，而非隔绝音乐的环境。

　　到底她是冷血谋杀室友的变态狂，还是不幸捲入无尽梦魇的清纯留学生？Netflix 原创纪录片《阿曼达·诺克斯》探索一桩恶名昭彰、名列世界各地头条新闻的凶杀桉，导演为罗德·布雷赫斯特 (Rod Blackhurst)（作品《独自》(Here Alone) 荣获翠贝卡电影节观众大奖）和布莱恩·麦金 (Brian McGinn)（作品《主厨的餐桌》(Chef’s Table) 荣获 IDA 奖），製作人为米特·海德 (Mette Heide)（作品《印度的女儿》(India’s Daughter) 荣获皮博迪奖）。

著名英国美食家RickStein这一次来到了上海，他在品尝地道上海菜的同时，还身体力行，走进渔村、老城区、海鲜市场，以一个英国人的视角，领略并解读了他眼中的上海文化。

　　Lucy Worsley traces the forgotten and fascinating story of the young Mozart's adventures in Georgian London. Arriving in 1764 as an eight-year-old boy, London held the promise of unrivalled musical opportunity. But in telling the telling the tale of Mozart's strange and unexpected encounters, Lucy reveals how life wasn't easy for the little boy in a big bustling city.
　　With the demands of a royal performance, the humiliation of playing keyboard tricks in a London pub, a near fatal illness and finding himself heckled on the streets, it was a lot for a child to take. But London would prove pivotal, for it was here that the young Mozart made his musical breakthrough, blossoming from a precocious performer into a powerful new composer.
　　Lucy reveals that it was on British soil that Mozart composed his first ever symphony and, with the help of a bespoke performance, she explores how Mozart's experiences in London inspired his colossal achievement. But what should have earned him rapturous applause and the highest acclaim ended in suspicion, intrigue and accusations of fraud.