$Hi$ I have a question in maintenance and evolution in software engineering. The two bullet points are not clear please clarify. Thanks Why software maintenance is inevitable?

$-$The system requirements are likely to change while the system is being developed.

Because the environment is changing. Therefore, a delivered system won't meet its requirements.

$--$Systems are tightly coupled with their environment.

When a system is installed in an environment it changes that environment and therefore changes the system requirements.