2015考研英语阅读保护大象刻不容缓_大学英语阅读

　　Since then it has fallen, also quite steeply, as plants have absorbed the surplus.

　　但自那以后，碳-14的数量也急剧下降，因为植物把剩余的碳-14吸收掉了。

　　And it will continue to fall until the old equilibrium reasserts itself.

　　并且碳-14的值会不断下降，直到降到原来的平衡值。

　　This bomb curve, as it is known, changes so fast that year-by-year differences in the 14Clevels of recent specimens should be detectable.

　　我们知道，这种爆炸曲线的变化如此之快，因此我们就可以探测出近期空气中每年碳-14值的不同。

　　To test this hypothesis, Dr Uno and his colleagues looked at 29 specimens of known age,from 1905 to 2008.

　　为对这一假想进行测试，Uno博士和他的同事研究了已知年代，即从1905年至2008年的29个样品。

　　These included elephants tusks, teeth and tail hair, and hippopotamus teeth.

　　这其中包括大象的长牙、牙齿和尾部的毛发，还有河马的牙齿。

　　They measured the specimens 14C content using a sensitive technique called acceleratormass spectrometry.

　　他们使用一项被称作加速器质谱的高灵敏度技术来测量样品中碳-14的含量。

　　For those tissues that had grown after 1955 the 14C concentration did, as the researchershoped it would, closely match the bomb curve.

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