For thousands of years, the ratio between the two has been the same.

经过了上千年，这两种碳同位素的比例一直是不变的。

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During the battle, the two sides have spent hundreds of thousands of troops.

会战期间，中日双方均投入数十万兵力。

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During the battle, the two sides have spent hundreds of thousands of troops.

会战期间，中日双方均投入数十万兵力。

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