“成倍”的拼音为：chéng bèi...

该厂产量成倍增长.The output of the factory has doubled and redoubled.资助教育的经费将成倍增加.Aid to education will increase manyfold.这里再一次发现,加入CCL4速度几乎成倍增长.Again it is found that addition of CCL 4 almost double the rate....

“成倍”的英语可以翻译为：twofoldness，gemination ...