新概念3英语逐句精讲: 第55课来自地球的问候

　　很多同学都在问如何自学新概念英语，为了方便同学们自学新概念，新东方在线为大家整理了新概念3英语逐句精讲: 第55课来自地球的问候，希望以下内容能够为大家的新概念英语学习有所帮助！

　　更多>>自学新概念:逐句精讲新概念英语3(汇总)

　　Lesson55 来自地球的问候

　　新概念3课文内容：

　　Recent developments in astronomy have made it possible to detect planets in our won Milky Way and in other galaxies. This is a major achievement because, in relative terms, planets are very small and old not emit light. Finding planets is proving hard enough, but finding life on them will prove infinitely more difficult. The first question to answer is whether a planet can actually support life. In our won solar system, for example, Venus is far too hot and Mars is far too cold to support life. Only the Earth provides ideal conditions, and even here it has taken more than four billion years for plant and animal life to evolve.
　　Whether a planet can support life depends on the size and brightness of its star, that is its 'sun'. Imagine a star up to twenty times larger, brighter, brighter and hotter than our own sun. A planet would have to be a very long way from it to be capable of supporting life. Alternatively, if the star were small, the life-supporting planet would have to have a close orbit round it and also provide the perfect conditions for life forms to develop. But how would we find such a planet? At present, there is no telescope in existence that is capable of detecting the presence of life. The development of such a telescope will be one of the great astronomical projects of the twenty-first century.
　　It is impossible to look for life on another planet using earth-based telescopes. Our own warm atmosphere and the heat generated by the telescope would make it impossible to detect objects as small as planets. Even a telescope in orbit round the earth, like the very successful Hubble telescope, would not be suitable because of the dust particles iron solar system. A telescope would have to be as far away as the planet Jupiter to look for life in outer space, because the dust becomes thinner the further we travel towards the outer edges of our own solar system. Once we detected a planet, we would have to find a way of blotting out the light from its star, so that we would be able to 'see' the planet properly and analyze its atmosphere. In the first instance, we would be looking for plant life, rather than 'little green men'. The life forms most likely to develop on a planet would be bacteria. It is bacteria that have generated the oxygen we breathe on earth. For most of the earth's history they have been the only form of life on our planet. As Earth-dwellers, we always cherish the hope that we will be visited by little green men and that we will be able to communicate with them. But this hope is always in the realms of science fiction. If we were able to discover lowly forms of life like bacteria on another planet, it would completely change our view of ourselves. As Daniel Goldin of NASA observed, 'Finding life elsewhere would change everything. No human endeavor or thought would be unchanged by it."

　　新概念英语3逐句精讲：

　　1.Recent developments in astronomy have made it possible to detect planets in our won Milky Way and in other galaxies.

　　天文学方面最新发展使得我们能够在银河系和其他星系发现行星。

　　语言点:make it possible to do sth.的意思是“使做某事成为可能。”

　　2.This is a major achievement because, in relative terms, planets are very small and old not emit light.

　　这是一个重要的成就，因为相对来说，行星很小，而且也不发光。

　　语言点:句子结构分析:because引导原因状语从句，说明“为什么是重要的成就。”

　　3.Finding planets is proving hard enough, but finding life on them will prove infinitely more difficult.

　　寻找行星证明相当困难，但是要在行星上发现生命会变得无比艰难。

　　语言点:is proving hard enough的意思是“证明…是困难的。”

　　4.The first question to answer is whether a planet can actually support life.

　　第一个需要解答的问题是一颗行星是否有能够维持生命的条件。

　　语言点:句子结构分析: whether a planet can actually support life充当表语从句。

　　5.In our won solar system, for example, Venus is far too hot and Mars is far too cold to support life.

　　举例来说，在我们的太阳系里，对于生命来说，金星的温度太高，而火星的温度则太低。

　　语言点:句子结构分析:too…to…结构表示“太…以致不能…。”

　　6.Only the Earth provides ideal conditions, and even here it has taken more than four billion years for plant and animal life to evolve.

　　只有地球提供理想的条件，而即使在这里，植物和动物的进化也用了40亿年的时间。

　　语言点:句子结构分析:take more than…to do的意思是“用了超过…的时间做。”

　　7.Whether a planet can support life depends on the size and brightness of its star, that is its 'sun'.

　　一颗行星是否能够维持生命取决于它的恒星—即它的“太阳”—的大小和亮度。

　　语言点:句子结构分析:whether a planet can support是主语从句。

　　8.Imagine a star up to twenty times larger, brighter, brighter and hotter than our own sun.

　　设想一下，一颗恒星比我们的太阳还要大，还要亮，还要热20倍。

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