Old English feowerfeald; see four + -fold. As an adverb from 1530s. Similar formation in Old Frisian fiuwerfald, Dutch viervoudig, Old High German fiervalt, German vierfältig, Danish firfold, Gothic fidurfalþs.
双语例句
1. 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。
来自柯林斯例句
2. 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.
来自电影对白
3. Electric hand is basic be electric head ache is fourfold.
电手基本是电头疼痛的四倍.
来自互联网
4. In some cases output has increased more than fourfold.
在有些情况下,产量增加了3倍多.
来自互联网
5. Web - based teaching has become a growing global trend . This paper is fourfold.
