1) the output has increased 3 times (registered a 3-fold increase;increased 200%)compared with 1997
产量比1997年增加了2倍
2) The rate increased by a factor of ten.
比率增加了10倍
3) The output increases 3 times.
产量增长了两倍。
4) the production increased 12.5% between January and March compared the corresponding period (the same time) last year
今年第一季度产量比去年同期增长了12.5%
补充资料：比率
比值。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条