1.in phase/out of phase (with sth)
协调；不协调
working/not working together in the right way
The traffic lights were out of phase.
红绿灯信号不协调。
The Skills Programme is out of phase with the rest of the curriculum.
技能课程与其他课程不协调。
2.phase in逐步实施（实行、开展）
to introduce or start using sth gradually in stages over a period of time
The new tax will be phased in over two years.
新税种将在两年内逐步实行。
The Health Secretary told Parliament that the reforms would be phased in over three years
卫生大臣对议会说，改革将在3年内逐步展开。
The new invoice system will be phased in over the next two months.
新发票制度将于今后两个月中逐步实行。
If passed, the plan will be phased in.
如果计划被通过的话，将逐步付诸实施。
3. phase sth↔out逐步废除
to stop using sth gradually in stages over a period of time
Subsidies to farmers will be phased out by next year.
对农民的补贴将在明年之前逐步废除。
You might think from the foregoing that the French want to phase accents out. Not at all.
根据前文所述，你们可能以为法国人打算废除各种口音。事实并非如此。
They said the present system of military conscription should be phased out.
他们说，当前的征兵体系应当逐步废除。