yán / jiū / rén / yuán / lì / yòng / xiàn / zhì / méi / tú / pǔ / bǐ / jiào / le / liǎng / fèn / D / N / A / yàng / běn研究人员利用限制酶图谱比较了两份DNA样本。The researchers used restriction mapping to compare two DNA samples.