This is the 13361st most frequent Russian word.
наблюдают
"наблюдают" – "observe" or "watch."
In this sentence, 'наблюдают' is used in the sense of systematically observing or studying something.
Ученые наблюдают изменения климата.
Scientists observe climate changes.
Here, 'наблюдают' means watching or paying attention to something happening in the surroundings.
Люди на улице наблюдают за проезжающими машинами.
People on the street watch the passing cars.
In this case, 'наблюдают' implies close attention or fascination towards a specific action.