他不住地挥响着鞭子,吆喝牲口.He continually cracked his whip and shouted at the mule.买主以稳定的价格买光了这一天牵到集市来的牲口.Buyers cleared the day's cattle run at steady rates.我去套牲口.I'll go and harness the beast....
Amazingly, these mitochondria were once free - living bacteria that were captured by an early single - celled eukaryote.令人惊奇的是, 这些线粒体曾是被早期 单细胞 真核生物俘获的自生细菌....