___ is committed to installation, operation and maintenance of the communication infrastructures.

【简答题】Rapidly growing urban populations are straining inadequate infrastructures.

Nowadays civil engineering does not only deal with designing fancy buildings, but also _____________ and __________everyday infrastructures

Existing infrastructures can be improved by retrofitting, which involves simply modifying the equipment that is already in service. (Para.6)[Analysis]“Which involves simply modifying the equipment that is already in service” is a non-restrictive attributive clause 1 the gerund, specifying the contents of “retrofitting”.[Translation] 2 ，这只需要对现有运行的设备做些改进。