Because it is an area of outstanding natural beauty, the number of boats available for hire on the river is limited.
这是一个自然风景极美的地方，所以河上可供租用的船只数量有限。
A number of scientists question the assumption that the presence of alien species can never be acceptable in a natural ecosystem.
一些科学家质疑这样的假设，即在自然生态系统中，外来物种的出现是绝对不会被接受的。
In the nineteenth century, scientists made a number of important, but unsuccessful attempts to calculate Earth's age from the record of various natural processes.
19世纪，科学家们做了许多重要的尝试，希望通过各种自然过程的记录来计算地球的年龄，但都未能成功。
To limit the number of telescopes on Mauna Kea, old ones will be removed at the end of their lifetimes and their sites returned to a natural state.
为了控制莫纳克亚山上望远镜的数量，旧望远镜将在使用寿命结束时被移除，因此这些场地将恢复到自然状态。
The grand mediocrity of today—everyone being the same in survival and number of offspring—means that natural selection has lost 80% of its power in upper-middle-class India compared to the tribes.
当今人与人在很大程度上的平等——即面对自然淘汰法则人人机会均等，并且连子嗣的数目都一样——意味着和在印度土著部落中的情况相比，印度中上层阶级中已丧失了80%的自然选择中的优势。
The grand mediocrity of today - everyone being the same in survival and number of offspring - means that natural selection has lost 80% of its power in upper middle class India compared to the tribes.
今天这种极其显著的平均化——每个人的生存机会和子女数量都相同——意味着，与部落相比较，自然选择在印度中上阶层已经失去了80%的效力。
The grand mediocrity of today everyone being the same in survival and number of offspring means that natural selection has lost 80% of its power in upper-middle-class India compared to the tribes.
今天这种极其显著的平均化——每个人的生存机会和子女数量都相同——意味着与部落相比较，自然选择在印度中上层已经失去了80%的作用。
The estuary keeps the surrounding land rich and fertile and provides a natural habitat for a number of threatened species, including the rare la Plata dolphin.
这处河口为周边地区带来了肥沃而富饶的土地，同时也为多种濒危物种如数量稀少的拉普拉塔海豚提供了自然栖息地。
Utilities have commissioned a number of projects to expand plants above natural deposits in North America.
北美的公共事业部门已经授权多个计划在天然蒸汽床上建设电站。
Prevention and control relies heavily on reducing the number of natural and artificial water-filled container habitats that support breeding of the mosquitoes.
预防和控制很大程度上是要减少住地那些有助蚊子滋生的自然和人为容器的数量。
For Cultural exchange it is necessary that the tourist number is low and that the interaction is natural meaning the hosting locals are unaffected or unpretentious in their approach.
在文化交流方面，控制游客数为少量是必要的，如果交流互动是自然的，这意味着对于游客的接近，当地主人能保持低调谦逊并不受其影响。
While it's unclear how many of these products also claim to be natural, given all the greenwashing going on these days, it's likely to number in the thousands.
但是不清楚这些产品有多少声称是天然的，如今公司为树立支持环保的形象而做虚假公关，因此这样的产品很可能数以千计。
Using the natural reflectivity of ceilings and walls, a transmitted infra-red signal can be received by any number of receivers within a room.
利用天花板和墙面的自然反射性，传送的红外信号能够被一个屋子里的所有接收器接收到。
This natural process has been vastly accelerated and amplified by a number of human practices, behaviours, and policy failures.
人类的一些做法、行为和政策失误，大大加速并放大了这一自然过程。
According to conservationists, Barrow Island is home to a number of endangered animals, which is why environmentalists are pushing for the liquefied natural gas plant to be built on the mainland.
根据自然资源保护目录，巴罗岛是大量濒危动物的家园，这就是为什么环保主义者们正在推动将液化天然气厂建在大陆的原因。
A number of examples can be given of the way in which natural environments are being rapidly changed - Amazonia, for instance.
可以举出很多很多的例子说明自然生态环境已经被迅速地改变了，亚马逊河流域就是最好的例证。
How much a natural disaster reduces output over the medium term depends on a number of factors.
对中期而言，自然灾害对产出减少的影响，主要取决于以下几个因素。
It is considering a number of ways of using its collections of photography, weaponry, orientalist art, natural history, Mughal jewellery, stamps and traditional costumes.
它正在使用一些方法，可以让收藏的摄影术，武器，东方艺术，博物学，莫卧儿时代的珠宝，邮票和传统服装物尽其用。
People didn’t come to realize the importance of planting trees until they (had) experienced a number of serious natural disasters.
经历了多次严重自然灾害后，人们才逐渐意识到植树造林的重要性。
Some of them are on a galactic scale12, and are associated with natural, periodic events which the Earth has suffered through a number of times previously.
一些因素来自银河系的范围[12]，并与地球多次遭遇过的自然的、周期性的事件有关。
In the 19th century, though, nature and philosophy went their separate ways as the natural philosophers grew in number, power and influence.
而到了十九世纪，随着自然哲学家们在其数量、知识能力与影响力上的增强，自然学科与哲学就分道扬镳了。
In the mid-1990s, Dr Berk found that laughter increases the number of natural killer cells in cancer patients. Natural killer cells are the body's way of fighting tumours.
早在上世纪九十年代，伯克博士就发现笑会增加癌症病人天然杀伤细胞(也叫抗癌细胞)的数目，天然杀伤细胞是身体对抗肿瘤的办法。
Then we say that for any other natural number, that fibonacci number is the sum of the previous two fibonacci numbers.
然后就是对其他自然数，其fibonacci数就是它前面两个数字的和，即F(N)=F(N-1)+F(N-2)。
"Conflicts are a natural result of the increasing number of bears; the two go hand in hand," said Chris Servheen, grizzly recovery coordinator for the U.S. Fish and Wildlife Service.
美国鱼类与野生物种服务机构的灰熊恢复计划协调员Chris Servheen表示，“随着灰熊数量的增加，冲突自然而然会出现，这两者是相伴相随的。”
Some even argue that squatting is a more natural position for 1 urination and 2 well, number two.
一些人甚至说对撒尿来说蹲姿是一种更自然的姿式。
In the set of natural Numbers, every number is either odd or even, and there is not one even number that is more or less even than any other even number.
在自然数的集合里，每个数字不是奇数就是偶数，不存在一个偶数或多或少比另一个偶数更像偶数这样的情形。
You could think of this correspondence as a buddy system in which each natural number is paired with some positive fraction, and vice versa.
可以把这种对应看作是各负责另一人之安全的两人同行制，每一个自然数都与某个正分数配对，反之亦然。
You could think of this correspondence as a buddy system in which each natural number is paired with some positive fraction, and vice versa.
可以把这种对应看作是各负责另一人之安全的两人同行制，每一个自然数都与某个正分数配对，反之亦然。
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