They gave mutual help to each other.

What will become of our close relations if the bilateral security treaty expires?

Discussion is based upon mutual respect.

Gravity is the natural force by which objects are attracted to each other.

Would you like to exchange links?

We concluded that mutual aid was essential for attaining the goal.

Before the arrival of this skyscraper, all the buildings in the city stood in special relationship to each other.

Love is a two-way street.