1·But doubling the diameter of the telescope's mirror, without changing its design, would increase its weight fourfold.
但是当望远镜镜片直径翻一番时，如果设计不变，其重量会增加四倍。
2·Beef production has fallen nearly fourfold.
牛肉的生产也降了近四倍。
3·Unirule noted that the profits of state-owned industrial companies had increased nearly fourfold between 2001 and 2009.
天则注意到，2001年至2009年期间，国有工业企业的利润增长了近四倍。
4·We have evaluated this clustering for several sample queries that restrict their search to a single group_PDB value (i.e., "HETATOM") and found that it can improve query performance fourfold.
我们已经通过几个将搜索限制于单个group _ PD b值(即hetatom)的样例查询评估了这种集群并发现它能够将查询性能提高四倍。
5·At that time, the city's total area increased fourfold through absorbing several outlying towns and villages.
在那个时候，城市的总面积增加了四倍，通过吸收一些边远城镇和村庄。