So, by measuring the ratio of the two isotopes in the rings of trees, and matching the result to the age of the ring, a history of hurricanes spanning the life of the tree can be reconstructed.
因此，通过测量树的不同年轮(ring)中两种氧同位素的比例，并将结果比对年轮所显示的树龄，就可再现树木一生中所经历的所有飓风。
The limits are valid for bearings before mounting under zero measuring load, and with no axial displacement of one ring relative to the other.
在测量负荷为零、而且一个套圈相对于另一套圈无轴向位移的情况下，这些限值对安装前的轴承有效。
The quality analysis for gas nitrocarburized inner gear ring of heavy truck imported from Austria was taken by means of macro/micro-examination, hardness measuring and running test.
利用宏观分析、显微检验、硬度测试和装车试验等手段，对引进奥地利重型汽车内齿圈按照新的气体氮碳共渗工艺处理后的质量进行了研究。
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