early 14c. as a type of men's garment, from Old French doublet (12c.), from diminutive of duble (see double (adj.)). From 1550s as "one of two things that are alike."
例文
1. dressed in doublet and hose
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2.We can refer to these duplicated chromosomes as Making up a doublet .
複製された染色体を二体と呼ぶ。
3.The desired operator is the spike doublet of Figure 40.