~との (with, attributive)

She was so absorbed in listening to the Beatles that she missed her date with him.

Meeting her has brought spiritual richness to his life.

The gap between the rich and the poor is widening all the time.

She enjoyed chatting with him.

She ignored my advice and kept seeing him.

You need to write conversations and reports with your boss in plain words, super-translated.

Maintaining upward compatibility with software written for the old system is important.

There's a fence marking the boundary with the next house.

The relationship between leaves and plants is equivalent to that between lungs and animals.

She'll surely keep her promise to him.