This is the 4860th most frequent Russian word.
инфраструктуре
The structure and facilities needed for the operation of a society or enterprise (infrastructure).
In this sentence, 'инфраструктуры' ('infrastructure') refers to the facilities and systems necessary for operation of a city, such as transportation and utilities.
Городская администрация работает над улучшением инфраструктуры.
The city administration is working on improving the infrastructure.
Here, 'инфраструктуре' ('infrastructure') refers to the general aspects and issues related to systems essential for functioning, in a discussion setting.
Вопросы об инфраструктуре были обсуждены на встрече.
Questions about the infrastructure were discussed at the meeting.
In this third sentence, 'инфраструктуры' ('infrastructure') pertains to the facilities and internal systems of a company or organization being upgraded.