环境工程专业英语unit2教案资料.ppt

《环境工程专业英语unit2教案资料.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、环境工程专业英语unit2Wateriscriticalcomponentofecologicalcycles.水是生态循环的关键组分。Aquaticecosystemsharbordiversespeciesandoffermanyvaluableservices.harbor，vt.隐匿，窝藏，庇护diverse，不同的，多种多样的水生态系统养护着很多的物种，同时提供许多有价值的服务。Unit2TheworldfreshwaterresourceHumanbeingsrequirewatert

2、orunindustries,toprovideenergy,andtogrowfood.人类需要水，使工厂运转，提供能源，生产食物。Inordertomobilizewaterforhumanneeds,webuildhugereservoirstostorewaterfordryperiodsandtoholdbackfloodwaters;为了使水能够满足人们的需求，我们修建了大型水库，以为干旱时期储存水和蓄积洪水。Unit2Theworldfreshwaterresourcewebuild

3、aqueductstotransportwaterthousandsofkilometersfromwater-richtowater-poorregions;我们修建渠道，把水从水量充足的地方输送到几千公里以外缺水的地方。weburnoiltogenerateelectricitytodesalinatesaltwaterinaridregions;我们燃烧石油用来发电，用于干旱地区的盐水淡化处理。Unit2Theworldfreshwaterresourceandwedreamoftowing

4、icebergsfromthepolarregionsandofreversingtheflowofmassiverivers.我们梦想着从极地拖动冰山，让大河逆流。Unit2TheworldfreshwaterresourceHarshrealitiesintrudeonthesedreams.intrudeon，入侵，闯入，打扰严酷的事实打碎了这些梦。Asweapproachthe21stcenturywemustnowacknowledgethatmanyofoureffortstoharn

5、esswaterhavebeeninadequateormisdirected.Harness，vt.利用,征服随着我们迈进21世纪，我们必须认识到，我们为了征服水而做的许多努力都是不适当的或错误的。Unit2TheworldfreshwaterresourceWeremainignorantofthefunctioningofbasichydrologicprocesses.我们对基本水文过程的功能仍然无知。Rivers,lakes,andgroundwateraquifersareincrea

6、singlycontaminatedwithbiologicalandchemicalwastes.groundwater，地表水生物和化学废物对河流、湖泊和地表水层的污染一直在加深。Unit2TheworldfreshwaterresourceVastnumbersofpeoplelackcleandrinkingwaterandrudimentarysanitationservices.很多的人缺乏洁净的饮用水和基本的卫生设施服务。Millionsofpeopledieeveryyearfro

7、mwater-relateddiseasessuchasmalaria,typhoid,andcholera.每年有数百万的人死于由水引起的疾病，如疟疾、伤寒和霍乱。Unit2TheworldfreshwaterresourceMassivewaterdevelopmentshavedestroyedmanyoftheworld’smostproductivewetlandsandotheraquatichabitats.大规模的水的开发已经损害了世界上许多最富于生产力的湿地和其它的水生栖息地环境

8、。Unit2TheworldfreshwaterresourceUnit2TheworldfreshwaterresourceTheeconomicandhydrologicresourcesformajornewirrigationprojectscannotbefound.大多数农田水利项目所需要的经济和水资源无法找到。Andexpectedchangesinglobalclimaticconditionswillalterfuturewatersupply,demand,an