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1.run up 迅速成长
There is enough power to run up to four lights.
电力足够带起4盏灯。
When I began to compete again, I was struggling with my run-up.
当我重新参赛后，我要解决助跑这一项。
2.step up 加快速度；走上前去
The teacher called Dabao to step up the platform.
老师叫大宝走上讲台。
He urged donors to step up their efforts to send aid to Somalia.
他敦促各捐赠方加快速度将援助物资送往索马里。
