1. Moving by turning over and over on an axis. [旋转的]

2. (of land) extending in gentle undulations. [（山峦）平缓起伏的]

3. Done or happening in a steady and continuous way. [逐渐的；逐步的；规则的；周而复始的]

It is a rolling pin.

它是擀面杖。

He walked with a rolling gait.

他走起路来摇摇摆摆。

The train journey took us through a valley past rolling hills.

我们乘坐火车沿一条山谷穿过绵延起伏的山峦。

The plan is for a rolling extension of the tax over the next ten years.

计划是在未来十年中将这一税种的征收范围逐步扩大。

轮流停电

rolling blackout/rolling power cuts

限电

power brownout

拉闸限电

power rationing