The age of Australia's rock art is constantly being revised, and earlier datings have been proposed as the result of new discoveries.

澳大利亚岩石艺术的年代一直在不断被修正，而且由于新的发现，人们提出了更早的测定年代。

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Attempts were made to calculate Earth's age from the thickness of surviving sedimentary rock and from the current level of the oceans' salinity.

人们曾试图根据现存沉积岩的厚度和目前海洋的盐度水平来计算地球的年龄。

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Better still, it became apparent to him that one could use radioactivity as a clock, with the half-life of a decay series enabling us to calculate the age of a rock.

更妙的是，显然人们可以用放射性作为时钟，用衰变系列的半衰期计算出岩石的年龄。

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Rod revisits the golden age of soul with a blues-rock rendition of Sam Cooke's "Wonderful World,"

VOA: standard.2009.11.25

One of the fathers of rock 'n' roll died Monday at the age of 79.

NPR: Bo Diddley, Architect of Rock, Dies

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At the foot of the red rock, there are remains dating back thousands of years: a Romano-Celtic temple, Bronze Age walls and structures built as long ago as the Neolithic period.

BBC: The Channel Islands�� surviving lore