A life without a friend is a life without a sun.
人生在世无朋友，犹如生活无太阳。
Be slow in choosing a friend; slower in changing.
选择朋友要审慎，摒弃更要审又慎。
A friend in need is a friend indeed.
患难见真交。
A father is a treasure, a brother is a comfort, but a friend is both.
父亲是财富，兄弟是安慰，朋友兼而有之。
A friend exaggerates a man's virtue, an enemy his crimes.
朋友宣扬人的美德，敌人夸大人的罪过。
A friend in court is better than a penny in purse.
囊中有钱，不如朝中有友。
A friend is a second self.
朋友是另一个我。
A friend is best found in adversity.
患难见真友。
A friend is never known till a man has need.
不到患难时，永远不能认识真正的朋友。
A friend is not so soon gotten as lost.
交友慢，失友快。
A friend to everybody is a friend to nobody.
广交友，无深交。
本文来源：http://www.010zaixian.com/zuowen/yanyu/216702.htm