My mother bought two doublets of goblets.
我妈妈买了两对酒杯。
The envelope is called a double of doublets.
这种峰叫做双合双重线。
So they would regenerate into mirrorimage doublets MID.
这是接块发育中是否发生对折的结果。
It was surprising when the alkali spectra showed unmistakable doublets.
当碱金属光谱显示出不容怀疑的双线结构时，是令人惊奇的。
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