translation.en: So a hominid genome is about three billion base pairs, but an elephant and mammoth genome is about two billion base pairs larger, and most of that is composed of small, repetitive DNAs that make it very difficult to actually re-jig the entire structure of the genome.
translation.zh: 原始人的基因大概有30亿对碱基对 但是大象和猛犸的基因 约多出20亿对碱基对 大部分是由小而重复的DNA组成的 这使得重组整个基因组变得十分困难