Friendship is not that easy to be（）when friends move far apart and live in different cities.

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• From ancient to modern times, friendship has always been the theme of many classic literary works.
• Ralph Waldo Emerson’s essay “Friendship” was published in his 1841 collection, “Essays：First Series”.
• The Chinese film You and Me tells us a beautiful cross-generation friendship.
• How does the narrator start friendship with Big Foot?
• The first thing to keep a long friendship is to contact with your friends not too often.