This is the 5593rd most frequent Russian word.
построены
"Built" or "constructed."
The word 'построены' is used in passive voice to state that the houses have been constructed using brick material.
Эти дома построены из кирпича.
These houses are built of brick.
Here 'построены' refers to the result of constructing roads using modern techniques.
Дороги построены по новейшим технологиям.
The roads are built using the latest technologies.
In this example, 'построены' is in the past perfect tense, emphasizing that the bridges were constructed before a specific time.