【正文】 程中將蒸騰掉大量的水分。對于供水受限制和季節(jié)性（降雨）的地方，植物根系的深度是很重要的。The total quantity of transpiration by plants over a long period of time is limited primarily by the availability of areas of abundant rainfall well distributed through the year, all plants will transpire at about the same rates and the differences in total will result from the differences inthe length of the growing seasons for the various water supply is limited and seasonal, depth of roots bees very , shallowrooted grasses wilt and die when the surface soil bees dry while deeprooted trees and plants will continue to withdraw water from lower soil deeperrooted vegetation will transpire a greater amount of water in the course of a rate of transpiration is not materially reduced by decreases in soil moisture until the wilting point of the soil is 。Transpiration is essentially the evaporation of water from the leaves of of transpiration will, therefore, be about the same as rates of evaporation from a free water surface if the supply of water to the plant is not free water evaporation may, therefore, be assumed to indicate the potential evapotranspiration from a vegetated soil ，因此，如果植物供水不受限制，蒸騰速率大約等于自由水面的蒸發(fā)率。在靜止的空氣中，氣壓差不久就變得較小，蒸發(fā)受水面水汽彌散速率的限制。在干旱地區(qū)，蒸發(fā)可以消耗掉大量的水庫存水。蒸騰是植物將從土壤中吸收的水分以汽體的形式釋放到大氣中去的過程。因此，人人有責對水采取保護措施和衛(wèi)生措施，這對于我們人類的未來是極端重要的。在許多地方，無論地面水或地下水都已經嚴重短缺了。在制造、發(fā)電、運輸、娛樂以及其他許多行業(yè)，水都起著很重要的作用。如果缺水，就會使農產品減產，就像缺乏鋼會引起汽車產量下降一樣。動物和家禽，如果用流動的水來喂養(yǎng)，那么每磅飼料和每個勞動小時會生產出更多的肉、奶和蛋。我們的農產品，大部分都是由它構成的?！?。人可以接近兩個月不吃食物而仍能活著，但不喝水則只能活三四天。沒有水就沒有生命。All life on earth depends upon water, the principal ingredient of living use of water by man, plants, and animals is it there can be no living thing requires can go nearly two months without food, but can live only three or four days without ，水是活細胞的基本組分（要素）。地球的兩極被大量的冰所覆蓋，%～2%的水蒸氣。在水中，氧這種最豐富的化學元素與氫結合，其含量多達89%。第二篇：水利專業(yè)英語翻譯部分Lesson 1 importance of water 水的重要性Water is best known and most abundant of all chemical pounds occurring in relatively pure form on the earth’s , the most abundant chemical element, is present in bination with hydrogen to the extent of 89 percent in covers about three fourths of the earth39。雷電風暴的形成，讓空氣溫度升高，然后上升到大氣。106頁Storm structureThe process by which a disturbance forms and subsequently strengthens into a hurricane depends on at least three waters and moisture are mentioned third condition is a wind pattern near the ocean surface that spirals air of thunderstorms form, allowing the air to warm further and rise higher into the the winds at these higher levels are relatively light, this structure can remain intact and allow for additional 。不止是這些造成了當?shù)鼐用裉貏e是在發(fā)展中國家難以得到基本日常所需，還會導致外來者在土地市場和遷移這些對當?shù)厝藢儆诮洕致缘念I域處于支配地位。此外，大量的達到目標水平的收入一般會經過滲漏再次離開當?shù)亍?home countries), and not to local businesses or addition, significant amounts of ine actually retained at destination level can leave again through ，利潤，支出的工資以及進口所需剩下的一部分，就是旅游目的地的直接收入，也叫做滲漏。these subtracted amounts are called most allinclusive package tours, about 80% of travelers39。土地合并項目經常用于保護濕地，還有改變土地利用模式，特別是在因為頻發(fā)的洪水和水土流失致使土地瀕臨消失的地方。修路需要符合地形。土地合并的項目的重點已經不再只關注農業(yè)重組，它上升到通過平衡農業(yè)利益，地形，自然保護，娛樂和運輸(尤其是需要修建主要干道的時候)來獲取最大的利益。Such agricultural improvements are still essential but rural space is now no longer regarded as one of agricultural production of rural development have bee much broader and have expanded to include increased environmental awareness and a wide range of nonagricultural emphasis of land consolidation projects has shifted from a focus on restructuring agriculture to one of achieving more efficient multiple use of rural space by balancing the interests of agriculture, landscape, nature conservation, recreation and transportation, especially when land is required for the construction of major ，但是現(xiàn)在農村地區(qū)不再僅僅是農業(yè)生產的區(qū)域了。因此早期項目的總體目標是通過增加產量和減少成本，以此增加從土地獲得的凈收益。改進農業(yè)結構看起來是和保留農村地區(qū)社會生存能力一樣的事情。what was good for the farmers was good for rural overall objective of early projects was thus to increase the net ine from land holdings by increasing the volume of production and decreasing its this focus on agricultural development, these projects served to consolidate parcels and enlarge holdings and included provisions such as irrigation and drainage infrastructure to improve water management, construction of rural roads, land levelling, soil improvement measures and changes to land use such as converting agriculturally inferior land into forest land or 。甚至村莊也可以用首位城市法則來分析。s primate city is Los Angeles, with a metropolitan area population of 16 million, which is more than double the San Francisco metropolitan area of 7 counties can be examined with regard to the Law of the Primate 。但是這個定義沒有體現(xiàn)從城市規(guī)模的角度分析，排名前兩位的城市也是不成比例的，所以并不被認可。但是，并不是所有國家都有這樣一個首位城市，你可以從下面的表里看出來。ll see from the list ，是整個國家的焦點。數(shù)以萬計的人民不得不背井離鄉(xiāng)。這正是上?，F(xiàn)在發(fā)生的，也可能是幾年以后上海出現(xiàn)的景象。海岸侵蝕開始出現(xiàn)，尤其是在陡峭的海岸。隨著冰蓋和冰川的融化。經歷這么大的變化曾經需要數(shù)千年，但是現(xiàn)在只在近十年內就完成了。56頁The increase of greenhouse gases are the primary causes of the humaninduced ponent of of burning of fossil fuels, land clearing and agriculture, the amount of CO2 and other greenhouse gases in the atmosphere have increased by more than a this large have historically taken thousands of years, but are now happening over the course of 。世界上所有國家的人口金字塔在這里都可以找到。發(fā)達國家的人口金字塔在不同年齡段大概是均勻分布的。發(fā)展中國家的人口金字塔通常有很大的根基和很窄的塔尖。Population Structure / Population PyramidsThe population structure for an area shows the number of males and females within different age groups in the information is displayed as an agesex or population pyramids of LEDCs typically have a wide base and a narrow represents a high birth rate and high death pyramids of MEDCs typically have a roughly equal distribution of population throughout the age top obviously gets narrower as a result of pyramids for every country in the world can be found pyramids are used to show the structure of the population according to age and 。這時的水本質上除了超過100攝氏度的情況是不可移動的。這種毛細作用可以報證土壤內的水的濃度是均勻的。所以這些過程都發(fā)生在表面。留下的那一部分雨水被稱為土地含水能力。下完雨之后，滲透會形成一個土壤完全充滿水的情況。Infiltration is the movement of water from precipitation into the