英語考試閱讀文章欣賞
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The oldest rocks on Earth have been discovered in Canada, offering scientists a glimpse at the origins of the planet, armounced scientists in a study to be published Friday.
科學家將會在本周五發表的一項研究報告中公布，他們在加拿大發現了目前地球上最古老的巖石，這一發現為科學家研究地球的起源提供了新的線索。
The rocks, found in a belt of ancient bedrock in Quebec, are eshmated to be 4.28 billion years old.
這些巖石是在加拿大魁北克省的一個古巖床帶發現的，據估計距今已有42.8億年的歷史。
The find pushes back the age of the most ancient discovered remnants ofthe Earth's crust by 300 million years.
這—發現將地殼上最古老殘留物的年代又向前推了3億年。
“Our discovery opens the door to further unlock the secrets ofthe Earth's beginnings," said Jonathan O'Neil, lead author ofthe study and a geologist at Gill Univarsity in Montreal, who collected and analyzed the rocks.
研究報告主要撰寫者、蒙特利爾邁克基爾大學的地質學家喬納森.奧尼爾對這些巖石進行了收集和分析，他說：“我們的發現為進一步探索地球的起源打開了-一扇門?！?/p>
"Geologists now have a new playground to explore how and when life began, what the atmosphere may have looked like, and when the first continent formed," said o'Neil.
“地質學家現在有了一個去探究生命何時以及如何起源、當時的大氣狀況以及第一塊大陸何時形成等問題的新的平臺。”
The rocks also suggest that continents formed very early in the Earth's history, said Richard Carlson at the Carnegie Institution in Washington, coauthor of the study, to be published in the September 26 edition of the journal Science.
研究報告撰寫者、華盛頓卡內基研究所的理查德·卡爾森說，這些巖石還說明，陸地在很早的時期就形成了,該研究將在9月26日的《科學》期刊上發表。
Estimates of the rocks' age were made using isotopic dating, a technique which can only be used to date rocks roughly 4.1 billion years old or older.
這些巖石的年齡是經過“同位素測年法”測定出來的。同位素測年法只能夠用于測定至少有41億年歷史的巖石的年代。
This is the first time the technique has been used to date terrestrial rocks, because nothing else this old has ever been discovered on Ealrth.
這一方法首次被用于測定陸地巖石的年代，因為之前在地球上還沒有發現過這么古老的東西。
The specimens were found in an area known as the Nuvvuagittuq greenstone belt, along the eastern shore of Hudson Bay in northern Quebec, a region recognized in 2001 as being a potential site for finding ancient rocks,
這些巖石發現于魁北克省北部哈德森灣東海岸沿線的Nuvvuagit-tuq綠石帶口2001年，地質學家曾鑒定有望在這地區發現古巖石。
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