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来源:雅诚德英语网
Other techniques allowed them to figure out exactly which year each ring represented.
其它的一些技术则使得他们可以精确的判断出每条年轮所代表的具体年份。
Other techniques allowed them to figure out exactly which year each ring represented.
其它的一些技术则使得他们可以精确的判断出每条年轮所代表的具体年份。