3 Metaphors for interchanges

" This interchange of letters was the beginning of a friendship that was to endure and strengthen through the lives of both poets, for they died in the self-same year.

Such an interchange of civilities, between two so prominent personages, was the signal of general hostilities among their respective followers.

With the American Governments of this hemisphere we continue to maintain an intercourse altogether friendly, and between their nations and ours that commercial interchange of which mutual benefit is the source and mutual comfort and harmony the result is in a continual state of improvement.

3 Metaphors for  interchanges