基本解释[计] 串联同根派生 英汉例句Objective:To study the feasibility of detecting free-fetal DNA in maternal plasma by multiplex short tadem repeat(STR) loci amplification. 目的：探索短串连重复序列（STR）多位点检测孕妇血浆中胎儿游离DNA的可行性。tadem system [计] 串联系统