The work will be phased over two years. 工作将在两年时间里分阶段进行。

The new regulations can be phased in over a number of months. 新规则可能要经过数月的时间才能被逐渐采纳。

Over the following three years, national currencies will be phased out. 在接下来的3年中，各国的货币会逐渐被废止。