为了应对考试，她决定在复习时间上有所增加。

She decided on a ___step-up in study time to prepare for the exam.

这次晋升意味着他在公司的地位有了显著提升。

This ___step-up means a significant advancement in his position at the company.

这台设备需要一个升压器来增加电压。

This device requires a ___step-up to increase the voltage.