friendship can not stand always on one side 礼尚往来，友谊常在
friendship multiples joys and divides griefs 友谊可以增添欢乐，可以分担忧愁
a life without a friend is a life without a sun 人生没有朋友，犹如人生没有了太阳（法国谚语）
a trouble shared is a trouble halved 两人分担，困难减半（英国谚语）
no road is long with good company 与良友为伴，路遥不觉远（英国谚语）
a long road tests a horse's strength and a long task proves a man's heart 路遥知马力，日久见人心
misfortune tests the sincerity of friends 患难见真交（英国谚语）
between friends all is common 朋友之间不分彼此
the best of friends must part 朋友虽好，终有一别
old friends and old wine are best 陈酒味醉，老友情深
the best mirror is an old friend 老友如明镜
it is good to have friends in trouble 人在危难时，朋友最可贵