英语翻译If the population of the earth goes on increasing at its present rate,there will eventually not be enough resources left to sustain life on the planet.By the middle of the 21st century,if present trends continue,we will have used up all t

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英语翻译If the population of the earth goes on increasing at its present rate,there will eventually not be enough resources left to sustain life on the planet.By the middle of the 21st century,if present trends continue,we will have used up all t

英语翻译If the population of the earth goes on increasing at its present rate,there will eventually not be enough resources left to sustain life on the planet.By the middle of the 21st century,if present trends continue,we will have used up all t
英语翻译
If the population of the earth goes on increasing at its present rate,there will eventually not be enough resources left to sustain life on the planet.By the middle of the 21st century,if present trends continue,we will have used up all the oil that drives our cars,for example.Even if scientists develop new ways of feeding the human race,the crowded conditions on earth will make it necessary for lus to look for open space somewhere else.But none of the other planets in our solar system are capable of supporting life at present.One possible solution to the problem,however,has recently been suggested by American scientist,Professor Carl Sagan.
Sagan believes that before the earth's resources are compleetely exhausted it will be possible to change the atmophere of Venus and so create a new world almost as large as earth itself.The difficult is that Venus is much hotter than the earth and there is only a tiny amount of water there.
Sagan proposes that algae organisms that can live in extremely hot or cold atmospheres and at the same time produce oxygen,should be bred in condition similar to those on Venus.As soon as this has been done,the algae will be placed in small rockets.Spaceship will then fly to Venus and fire the rockets into the atmosphere .In a fairly short time,the alge will break down the carbon dioxide into oxygen and carbon.
When the algae have done theri work,the atmosphere will become cooler,but befor man can set foot on Venus it will be neccessary for the oxygen to produce rain.The surface of the planet will still be too hot for man to land on it but the rain will eventually fall and in a few years something like earth will be reproduced on Venus.

英语翻译If the population of the earth goes on increasing at its present rate,there will eventually not be enough resources left to sustain life on the planet.By the middle of the 21st century,if present trends continue,we will have used up all t
如果地球的人口继续以目前的比率增加,最终不会有足够的资源来支撑这个星球上的生命.例如,如果继续目前的趋势,到21世纪中期为止,我们将用光发动我们的汽车的所有石油.尽管科学家们研发了新的供给人类的方法,在地球上拥挤的状况对于我们来说寻找其他开放的空间是有必要的,但是目前在我们的太阳系中没有其他的行星有维持生命的这个能力.然而这个问题的一个可能的解决办法近来由美国科学家卡尔.萨根提出了建议.萨根相信在地球资源完全枯竭之前,有可能改变金星的大气并且创造出几乎和地球本身一样大的的新世界.困难是金星比地球热多了并且在那只有微量的水.萨根提议在与金星相似的条件下种植能够在极其冷或热的空气中生存并同时制造氧气的藻类生物.这件事一做完,就把这个藻类安放在小火箭中.然后宇宙飞船飞往金星把火箭发射到金星的空气中.在相当短的时间内,藻类会把二氧化碳分解成氧和碳.
当藻类做完它们的工作时,空气将会变得较凉爽,但是在人类登上金星前,对于氧来说产生雨是有必要的.这个星球的表面对于人类太热了还不能登陆,但是最后会降雨,在几年后,像土壤一样的东西会在金星上被复制.

如果全球人口按吸纳在的增长速度,终究有一天我们这个星球上的资源将会变得不够以维持生活。到本世纪中叶,如果现在的趋势继续发展下去,我们将会用光例如汽车燃油之类的资源。即使科学家研究其他养活人类的新方法,地球上的这种拥挤状况也会使我们寻找外太空成为必须做的事。但目前为止,太阳系中还没有其他的星球适合人类居住。可能的一种解决办法,近期被美国科学家 Carl Sagan.主任提出,他相信在地球资源耗竭之前...

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如果全球人口按吸纳在的增长速度,终究有一天我们这个星球上的资源将会变得不够以维持生活。到本世纪中叶,如果现在的趋势继续发展下去,我们将会用光例如汽车燃油之类的资源。即使科学家研究其他养活人类的新方法,地球上的这种拥挤状况也会使我们寻找外太空成为必须做的事。但目前为止,太阳系中还没有其他的星球适合人类居住。可能的一种解决办法,近期被美国科学家 Carl Sagan.主任提出,他相信在地球资源耗竭之前有办法来改变金星的气候并且自身创造出和地球一般大小的星球。问题是金星上的气温要比地球高得多,而且上面只有少量的水。他假设如果藻类真核微生物能够在极度高温或极度低温气候下生存并且产生氧气的话,应该可以在金星这样类似的条件下繁殖。只要这种设想成功,那么藻类可以放在小型火箭上。宇宙飞船将会飞向金星并且将那些藻类释放到空气中。在相对较短的时间里,藻类会将二氧化碳分裂成为氧气和碳。
藻类完成他们的工作以后,气候将会变得相对较冷,但是在人类踏上金星之前必须使氧气产生雨。金星的表面温度依然太高而使人不能踏入,但是雨水最终会降落,而且几年之后像地球一样的星球将会在金星诞生!
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如果世界人口继续以现在的速度增长,这个星球将会资源耗竭,最终导致生命无法生存。比如,假若这股潮流继续,到21世纪中叶,我们将用完所有供应汽车的石油。尽管科学家们找到许多种办法养活人类,但人口过多的状况将迫使我们在外太空寻找适合人类生存的地方。可现今为止太阳系里的其他星球都不适合生物生存。然而最近,美国科学家卡尔·萨根教授提出了一个可能的办法。
  萨根相信在地球资源被完全消耗之前,我们可以...

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如果世界人口继续以现在的速度增长,这个星球将会资源耗竭,最终导致生命无法生存。比如,假若这股潮流继续,到21世纪中叶,我们将用完所有供应汽车的石油。尽管科学家们找到许多种办法养活人类,但人口过多的状况将迫使我们在外太空寻找适合人类生存的地方。可现今为止太阳系里的其他星球都不适合生物生存。然而最近,美国科学家卡尔·萨根教授提出了一个可能的办法。
  萨根相信在地球资源被完全消耗之前,我们可以改变金星的大气,从而创造一个跟地球几乎一样大的新世界。面临的困难是金星的气温比地球要高,而且只有很少水分。
  萨根认为在极热或极冷气温下生存且能产生氧气的藻类有机体也可以在金星的环境中生长。如果这种说法成立,藻类植物将放到小型火箭上,伴随太空飞船抵达金星,然后被发射到金星的大气层中。假以时日,藻类的分解活动就会把二氧化碳转化成氧和碳。
  当藻类的“任务”完成时,金星的气温就会降下来,但在人类可以踏上金星之前,还有必要让氧气产生雨水。金星的表面温度对人类来说还是太热,但降雨能在数年内让金星变得越来越像地球。

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英语翻译The United States of America covers a large part of North America.Its neighbors are Canada to the north.Although the United States is a big country,it is not the largest in the world.Washington D.C.is the country’s capital.Its populatio 英语翻译( )( )( )( )if you go to the supermarket 英语翻译If you feel the same way 英语翻译If I look up into the 英语翻译:What if not the driver? 英语翻译the policeman asked John if he knew the victim. 英语翻译What - - - me if I break the rule? 英语翻译if we_________________,it will________for us_____________these birds in the future. 英语翻译if the winter comes,can spring be far behind 英语翻译If a parent dies,the family may ____ ____. 英语翻译No weather is ill,if the wind be still. 英语翻译the read quickly and see if you are right 英语翻译press the CHECK button to check if you can use the name of the character 英语翻译If you aren't gonna use your heart,the what's the different if it gets broken? 英语翻译If the auditor concludes that the possible effects on the financialstatements of undetected misstatements,if any,could be material but notpervasive,the auditor shall qualify the opinion 帮忙看下有没有语法或者拼写的错误 this chart shows that the population is increase year by year.before the 1850s ,the population increased stable and slow.but it has changed after the 1850s.expecially after the 19century ,the populatio 1.The passage mainly talked about robot caregivers for the elderly to lilt market.2.The underlined word “backed” in the last paragraph means supported .3.From the last paragraph we know that China has the world’s largest elderly populatio 1.The passage mainly talked about robot caregivers for the elderly to lilt market.2.The underlined word “backed” in the last paragraph means supported .3.From the last paragraph we know that China has the world’s largest elderly populatio