denudation chronology
... denudation剥蚀〔作用〕 denudation chronology剥蚀年代 dependency population依赖人口；受抚养人口 ...
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剥蚀年代学 denudation chronology
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这些锆石是从年代更久远的岩石上被剥蚀下来之后进入杰克山的岩石中的，研究人员费了很大力气才把这些锆石晶体从其它矿物碎片中拣选出来。
These zircons ended up in the Jack Hills rocks after eroding from rocks that were even more ancient, and the researchers painstakingly sorted the individual crystals from other bits of minerals.
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