英语流行语：何为“架子上的朋友”？

英语自学网

　　情场上有备胎，难道友谊的世界也有备胎?有的，这种备胎叫“架子上的朋友”(shelf friend)。
        　　You become a shelf friend when you become an option. You are not first pick
of friends. When your friend starts dating someone and you are put up on a shelf
until they have no other people to hang with.
        　　当你成为“备选项”，你就成了“架子上的朋友”。朋友们找人一起出去玩不会第一个想到你。当你的朋友开始约会，就不会再联系你，除非找不到其他人可以一起玩。
        　　Example:
        　　I was put up on the shelf until she had a need for me. I was her shelf
friend.
        　　她总是有需要的时候才来找我，我是她的“备胎朋友”。