phase
单词辨析：
指发展或变化过程中的某一个阶段。
The building is in the design phase.
这栋大楼正处于设计阶段。
The critical phase of that experiment will last three months.
那个实验的关键性阶段将持续3个月。
指有开始和结束的一段时间。
His studies improved in a very short period of time.
他的学业在很短的时间里便取得了进步。
New employees have been trained over a six-week period.
新员工接受了为期6周的培训。
指某种活动、天气、疾病等持续的一段时间，通常为期较短。
After a short spell in the army, he returned to his former university.
在部队呆了一小段时间后，他又回到原来的大学。
She worked a spell as a teacher before becoming a civil servant.
在成为公务员以前她当过一阵老师。
指成长或发展的某一时期，也可指某一进程、活动等中的一个阶段。
the early stage of a kid's development
儿童成长的早期
These two teams reached the final stage of the competition.
这两支队伍进入了决赛阶段。
相关例句：
He proposed that only those countries which were willing and able should opt in to phase three
他提议只有那些有意愿而且有能力的国家才应参与第三阶段。
This provides traceability linkage in this phase.
这提供了这个阶段的可追溯性链接。
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。
The phase of writing that is actually most important is revision
实际上写作过程中最重要的阶段是修改。
Just as in the dark-ground method phase objects are then perceptible.
正像在暗场法中一样，相物体这时就可以看见了。
McCarthy was asked to analyse the data from the first phase of trials of the vaccine
麦卡锡被要求对第一阶段疫苗试验的数据作出分析。