By the late eighties their number had grown fourfold.到80年代末的时候，他们的数量已是原来的4倍。For a diagnosis of tularemia you need a fourfold increase in serum antibody levels.要诊断是兔热症,她的血清抗体等级需要有4个部分的增长.Electric hand is basic be electric...

adj.四倍的，四重的adv.四倍，四重...

fourfold的音标：fourfold的英式发音音标为：['fɔ:fəʊld]fourfold的美式发音音标为：['fɔrfoʊld]...