a two-fold increase

Those men who never smoked fared even worse, with a two-fold increase in risk.

那些从不吸烟的男性进展更糟糕，风险增加两倍。

With policing severely curtailed, counterfeiting took off in 1995—Qian estimates a nearly 100-fold increase in the production of fakes within just two years.

由于监管力度削弱了，1995年造假行为开始泛滥。 据易千估计，仅在两年内仿冒品生产数量就增加了100倍。

There has been a four-fold increase in couples breaking up for these reasons in the last two years, amid increasing financial strain on families.

随着家庭经济压力的增大，在过去两年中因为这些原因分手的夫妇的数量增加了四倍。