We did the first stage of the trip by train.

旅行的第一段我们乘的是火车。

《牛津词典》

The first stage in research is data collection.

研究工作的第一步是收集资料。

《牛津词典》

Having completed the first stage, you can move on to step 2.

第一阶段完成后，你就可以接着进行第2步了。

《牛津词典》

"The first stage, which is kind of concrete, they try to do something where there is some measurement involved.

VOA: standard.2010.08.10

Now what's interesting is in societies where marriages are arranged this is often the first stage of a love relationship.

有趣的是,在婚姻包办的社会里,这初始阶段的爱情。

耶鲁公开课 - 心理学导论课程节选

So, for Piaget, the first stage is the sensorimotor stage or the sensorimotor period.

皮亚杰认为,第一个阶段,是感知运动阶段,或者说,感知运动期

耶鲁公开课 - 心理学导论课程节选

The first stage was 117km based on a 13km circuit around Chew Valley Lake.

BBC: Juniors struggle in second round of British road series

The first stage in the process is to identify what patients communicate while in intensive care.

BBC: Computers speak for intensive care patients

We saw the makings of a resort town in the first stage called Dasve.

FORBES: A Stop in India's Lavasa