It has been estimated that an additional one-fourth of the Earth's land surface is threatened by this process.
据估计，地球表面另外四分之一的土地正面临沙漠化威胁。
Although many people do not think of homosexual relationships as resulting in a family, it has been estimated that about one of five gays and one of three lesbians enter a homosexual marriage.
虽然许多人不认为同性恋关系会产生家庭，但据估计，大约五名男同性恋者和三名女同性恋者中有一名进入了同性恋婚姻。
It has been estimated that if the bridge were packed with cars.
据估计，即使桥上停满了汽车。
It has been estimated that the United States now has nearly 800,000 gang members.
据估计现今美国以有约八十万个帮派成员。
But it has been estimated that as many as 70,000 children are sold by gangs each year.
但是，据估计每年大约有70,000个儿童被犯罪团伙买卖。
It has been estimated that about 160 languages and dialects are spoken by children in London schools.
据估计，伦敦学校的孩子所使用的语言和方言和方言大概有160种。
It has been estimated that by 2009, China will become the world's biggest producer of greenhouse gases.
有预期说到2009年，中国将成为全球最大的温室气体排放国。
It has been estimated that 20%-35% of the precipitation originates in the "seeder" zone and the remainder in the lower clouds.
据估计，大约20——35%的降水来源于“催化剂”区，其余的来源于低层云系。
It has been estimated that if the bridge were packed with cars, it would still only be carrying a third of its total capacity.
据估计，如果桥上挤满汽车，也仍然只有它总负载能力的三分之一。
It has been estimated that at any given moment a quarter of mankind is afflicted with severely debilitating protozoan diseases.
估计人类的四分之一深受原生动物性疾病之害。
It has been estimated that smokers have made up half of the population in China. And the smokers are becoming younger and younger.
据估计，在中国吸烟者约占总人口的一半，而且烟民的年龄越来越年轻，甚至一些中学生也在抽烟。
It has been estimated that 90% of seafood from the Gulf of Mexico is produced by the marshes of Louisiana, Mississippi and Alabama.
据估计，墨西哥湾百分之九十的海产品产自路易斯安那、密西西比和亚拉巴马州湿地。
The report says: "it has been estimated that 75-90 percent of all visits to primary care physicians are for stress-related problems."
该报告称，具估计，日常人们去看医生75%- 90%是因压力而产生的不舒服。
It has been estimated that a single large rainforest or coniferous tree has an evaporative surface area roughly equal to a 40 acre lake.
据估计，单独一个大雨林或针叶林其蒸发面积大约相当于一个40英亩的湖泊。
It has been estimated that around half of the energy used in a wealthy country is necessitated by projects designed to expand the economy.
对于富有国家所消耗的能源，估计大约一半是用于扩充国家经济的计划。
It has been estimated that only about 0.1 percent of your dietary Lysine is converted to Carnitine in the body, in most normal situations.
据估计，在人体正常环境下，大约只有0.1%的膳食中的赖氨酸转换为左旋肉碱。
It has been estimated that, when reading, words stand a good chance of being remembered if they have been met at least seven times over spaced intervals.
在阅读中记单词是最好的方法。据估计，一个生词如果在不同的时间内在阅读中出现七次，那么读者就很容易记住。
It has been estimated that within five years, one South African will die of an AIDS-related illness every minute unless effective action is taken now to curb AIDS.
估计，如果不采取有效措施控制艾滋病的话，五年后南非每分钟会有一人因艾滋病而死亡。
It has been estimated that up to 10 percent of the world's population are left-handers and even now, many are still discriminated in society for being born that way.
据统计，世界上现在有10%的人口都是左撇子，然而至今他们中的很多人仍遭受着不公平对待。
It has been estimated that over 100,000 types of beads were developed in a vast range of color combinations, using the full gamut of Murano's glass-making techniques.
据估计，慕拉诺的能工巧匠们制作的，各种颜色组合的玻璃珠子，超过100,000种。
Of cars still using leaded petrol, it has been estimated by the NRMA that 30% could use unleaded fuel immediately, with no charges required to the vehicle or engine.
据NRMA估计，仍然使用含铅汽油的汽车中，30%能够立即使用无铅汽油而不需要对车辆和引擎做任何改动。
It has been estimated that over 100, 000 types of beads were developed in a vast range of color combinations, using the full gamut of Murano's glass-making techniques.
据估计，慕拉诺的能工巧匠们制作的，各种颜色组合的玻璃珠子，超过100,000种。
It has been estimated that companies can lower their communications costs by as much as 80% by placing their voice traffic through the unused space in their data networks.
据估计，公司可以降低通信成本高达80%的声音，把剩余的空间，他们的交通数据通过网络。
Based on the results of that study it has been estimated that the Swiss could avert 17 000 nosocomial infections each year if hospitals nationwide achieved comparable improvements.
基于该研究结果，估计假如全国各个医院都有相对改进的话，瑞士每年可以避免17 000例医院内的感染。
For example, it has been estimated that two-thirds of the sales of Gillette's Sensor razor came from consumers who would otherwise have been customers for the company's other razors.
比如，据估计，三分之二吉列传感剃须刀的消费者可能也购买了吉列其他型号的剃须刀。
It has been estimated that the weight of all the insects destroyed by spiders in Britain in one year would be greater than the total weight of all the human beings in the country.
据估计，在英国蜘蛛一年里所消灭昆虫的重量将会超过这个国家人口的总重量。
It has been estimated that the weight of all the insects destroyed by spiders in Britain in one year would be greater than the total weight of all the human beings in the country.
据估计，在英国蜘蛛一年里所消灭昆虫的重量将会超过这个国家人口的总重量。
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