You are given a sentence in Polish. Your job is to translate the Polish sentence into Arabic.
One example: Poradzi sobie, ale trzeba na nią uważać.
Solution is here: لذا نعلم أنها ستكون ناجحة. ولكن علينا مراقبتها
Explanation: The Polish sentence is correctly translated into Arabic, because the meaning is preserved.

Now, solve this: Kiedyś mieliśmy grube ściany,
Solution:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
في الماضي ، قبل مكيفات الهواء ، كانت لدينا جدران سميكة.