诗人汪国真说：只是相思情太浓，仅用相识意太淡，友情是相知，味甘境又远。

普通朋友：casual acquaintances

people you know on a basic level, but with whom you don't have a significant relationship.

例如：火车上认识的朋友、参加某个活动一起认识的朋友

好朋友：good friend or close friend

friends with whom you have an especially strong relationship.

例如：室友、同学

知音、知己：soul mate

two people are designed to be together.

普通朋友能赶走暂时的无聊，好朋友能同甘共苦，知音会让自己不孤独。

【欢迎订阅美语操练俱乐部】学英语不是一次性学很多，而是每天都学一点点，养成良好的英语学习习惯！