词汇	extinct language
释义	extinct language 死语,消亡语
随便看	Principal Subordinate Commander principal subset selection principal subsidiary lobe principal subspace principal substance principal sulcus principal sum principal sum of the bill of exchange principal sums principal sum secured by a mortgage principal supplying body principal supplying interest principal supply road principal support principal surface Principal Surface Combatants principal surface of accumulation principal surface tension principal surveyor principal switch selection principal symbol principal symmetry plane principal sympathetic neuron principal syndrome principal synoptic observation