因此，尼尔森和佩特森转向其他X射线试验，以验证他们的发现。

So Nilsson and Petterssonturned to other X-ray experiments to confirm their claims.

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为了估算年龄，尼尔森及其小组采用了一种结合化学试验、数学模型和生长测量的复杂系统。

To get the age estimates, Nielsen and his team used a complex system that combines chemical tests, mathematical models and growth measurements.

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