What's the first stage of a negation according to the man?

根据那个人的说法，否定的第一阶段是什么？

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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》

The only passenger on that first stage to travel all the way through to San Francisco was a newspaper reporter named Waterman Ormsby.

VOA: special.2010.04.26

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

On another bike, one of his teammates couldn't shift gears during the entire first stage.

WSJ: Tour de Pakistan Is a Tough Ride