This is the 17508th most frequent Polish word.
zaznaczyły
"Zaznaczyły" means "they marked" or "they indicated" in English.
In this sentence, 'zaznaczyły' is used in the sense of marking or highlighting some elements for emphasis in their notes.
Uczennice zaznaczyły ważne punkty w swoich notatkach.
The students highlighted important points in their notes.
Here 'zaznaczyły' is used figuratively to mean showing or indicating a noticeable trend.
Dane na wykresie wyraźnie zaznaczyły trend wzrostowy.
The data on the chart clearly indicated an upward trend.
In this context, 'zaznaczyły' is used to emphasize or point out a particular impact observed by scientists.