phase down(v.+adv.)
逐步减少lessen gradually
▲phase sth⇔down
The program to phase down waste in natural sources is progressing successfully in the country.逐步减少自然能源的浪费正在这个国家顺利进行。
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phase in(v.+adv.)
逐步采用introduce (sth) in stages or gradually
▲phase sth⇔in
We should phase in the new working plans.我们应逐步采用新的工作计划。
The company has phased in a series of new production plans.这家公司已采用了一系列新的生产计划。
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phase out(v.+adv.)
逐步淘汰,逐步结束stop or remove (sth) in stages or gradually
▲phase sth⇔out
The machine has been phased out.这种机器早已过时了。
The factory has already phased out a batch of production equipment.这家工厂已经淘汰了一批生产设备。

用作及物动词
▲S+～+n./pron.
◇ 用于be ～ed结构
The new educational policy will be phased over the next several years.新的教育政策将在未来几年内分阶段实施。

［同义词］ n.  condition, degree, level, step, view
［词源］＜希腊语phasis(阶段)

in phase
〈物理〉同相working or going together (with another or each other)
The camshaft rotates in phase with the crankshaft, but at half its speed.凸轮轴和曲轴协调旋转,但速度仅是曲轴的一半。
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out of phase
〈物理〉异相not working or going together (with another or each other)
The carrier wave has got out of phase with the signal wave.载波同信号波是异相的。

It was a very important phase of history.它是一个非常重要的历史阶段。
There was a new dangerous phase between each other.双方的关系进入到一种危险的状态。
The phases of the moon include the new and the full moon.月相包括新月和满月。

phase, angle, aspect, side
参见aspect条。
phase, stage
这两个词都可指发展的阶段或时期,但stage除了与介词of连用以外还可与at连用; 另外,侧重于外观变化时用phase,不用stage。