专业外语复习资料.doc

1、In radiation, thermal energy is transformed into radiant energy, similar in nature to light.热能在辐射时转换成性质与光相似的辐射能 2、The force upward equals the force downward so that the balloon stays at the same height.向上的力与向下的力相等，所以气球就保持在这一高度。 3、 Apart from providing people with timber, forests help regulate climate, conserve water and soil, wall off wind, fix sands, improve water quality, keep away smoke and dust, sterilizer(purify) the air, reduce noice, beautify surroundings, maintain and improve ecological balance. Man would not be able to exist without green plants producing oxygen and absorbing harmful gases all the time. Man抯 health is closely related to the quality of the air, which in turn is decided by the size(extent) of forests. Many kinds ofw trees can absorb poisonous and cancer-causing substances in the air. The amount of bacteria in a forest area make up but 1% of that in a deforested area. While the air in a department store contains more than 4 million bacteria per cubic meter. A tree-covered area may reduce noise by a quarter. Moisture content in the air above or around a forest is 10-20% more than that of the places devoid of forest. Generally, the rainfall in a forestry area is 17% more than that of non-afforested area. The volume of water held by a 50000-mu forest is equal to a reservoir of 1 million cubic meters. The green trees are pleasant to the eye. It helps to ease the tension of mind, and enhance the sense of beauty. 森林给人们提供木材，还能调节气候、保持水土、防风固沙、改善水质、防烟防尘、消毒杀菌、减少噪音、美化环境、维持及改善生态平衡。 如果没有绿色植物不断制造氧气和吸收有害的气体，人类就无法生存。人们的健康与空气的优劣有关，二空气的优劣又与森林的多少有关。 许多树木都能吸收空气中的有害物质和致癌物质。林区空气中的细菌数量只有无林区的1%。二百货商店内每立方米空气中则含有400多万个细菌。绿化区可以使噪音减弱四分之一左右。森林上空和附近的空气的含水量比无林地区多10%--20%；林区降雨量一般比非林区多17%，5 万亩 森林所涵养的水相当于100万立方米容量的水库。树木的绿使人看了舒适，有利于缓和紧张心情，给人以美的享受。 4、 转基因动物生物安全研究与评价 摘要: 随着转基因动物在新品种培育、异种器官移植、生物反应器和疾病模型等方面的研究与发展，转基因动物的生物安全性引起了人们的广泛关注。目前，各国政府与机构已制定了相应的法律法规来规范转基因动物的研究与应用。文中介绍了转基因动物生物安全研究的内容、评价原则、评价政策与程序、上市或有望上市的转基因动物产品。最后，对转基因动物