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这一次是碳同位素泄露了秘密。
This time, it is carbon isotopes that give the game away.
youdao
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经过了上千年，这两种碳同位素的比例一直是不变的。
For thousands of years, the ratio between the two has been the same.
youdao
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碳有好几种同位素。
Carbon has several isotopes.
youdao
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碳有好几种同位素。
Carbon has several isotopes.
youdao