萬物簡史:PART I CH 2_10
來源:滬江聽寫酷
2011-08-05 07:00
這是一部有關(guān)現(xiàn)代科學(xué)發(fā)展史的既通俗易懂又引人入勝的書,作者用清晰明了、幽默風(fēng)趣的筆法,將宇宙大爆炸到人類文明發(fā)展進(jìn)程中所發(fā)生的繁多妙趣橫生的故事一一收入筆下。驚奇和感嘆組成了本書,歷歷在目的天下萬物組成了本書,益于人們了解大千世界的無窮奧妙,掌握萬事萬物的發(fā)展脈絡(luò)。
收獲英語 收獲一本好書~!
書本的朗讀語音很charming的磁性英音~~~大家可以好好學(xué)著模仿哦~~~??!
因為原著為美國人所寫,單詞采用美式拼法,不抄全文,然后聽寫單詞或詞組(用[-No-]表示)以及句子(用[---No---]表示)。請邊聽寫邊理解文意,根據(jù)上下文注意各句標(biāo)號,這樣有助于提高正確率。
Hints
Oort
Pluto
Of course we have no [-1-] of such a journey. A trip of 240,000 miles to the Moon still represents a very big undertaking for us. A [-2-] mission to Mars, called for by the first President Bush in a moment of passing giddiness, was quietly dropped when someone worked out that it would cost $450 billion and probably result in the deaths of all the crew (their DNA torn to tatters by high-energy solar particles from which they could not be shielded).
[---3---] It is just too far. As it is, even with the Hubble telescope, we can’t see even into the Oort cloud, so we don’t actually know that it is there. Its existence is probable but entirely [-4-]. (Properly called the Opik-Oort cloud, it is named for the Estonian astronomer Ernst Opik, who hypothesized its existence in 1932, and for the Dutch astronomer Jan Oort, who [-5-] the calculations eighteen years later.)
[---6---] The basic unit of measure in the solar system is the Astronomical Unit, or AU, representing the distance from the Sun to the Earth. [---7---] In a word, it is remote.
prospect
manned
Based on what we know now and can reasonably imagine, there is absolutely no prospect that any human being will ever visit the edge of our own solar system—ever.
hypothetical
refined
About all that can be said with confidence about the Oort cloud is that it starts somewhere beyond Pluto and stretches some two light-years out into the cosmos.
Pluto is about 40 AUs from us, the heart of the Oort cloud about 50,000.
當(dāng)然,我們沒有打算去做這樣一次旅行。做一次38.6萬公里遠(yuǎn)的月球旅行,對我們來說依然是一件了不起的大事。老布什總統(tǒng)曾一時頭腦發(fā)昏,提出要執(zhí)行一次去火星的載人任務(wù),但后來不了了之。有人估計,這要花費(fèi)4500億美元,最后很可能落個全體乘員命歸黃泉的結(jié)局(他們無法遮擋高能的太陽粒子,DNA會被撕得粉碎)。
根據(jù)我們目前掌握的知識和理智的想像,任何人都絕對不會前往我們自己太陽系的邊緣--永遠(yuǎn)不會。實在太遙遠(yuǎn)了。事實上,即便使用哈勃望遠(yuǎn)鏡,我們也看不到奧爾特云,因此我們實際上不知道它在哪里。它的存在是可能的,但完全是假設(shè)的。1
關(guān)于奧爾特云,有把握的只能說到這種程度:它始于冥王星以外,向宇宙里伸展大約兩光年。太陽系里的基本計量單位是天文單位(AU),代表太陽和地球之間的平均距離。冥王星距離我們大約40個天文單位,奧爾特云的中心離我們大約5萬個天文單位。一句話,它非常遙遠(yuǎn)。
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