订交

wǒ men yī dàn dìng jiāo bù guǎn zuì hòu fā xiàn zhè xiē rén shì duō me tǎo yàn duō me wú yì yào xiǎng bǎi tuō tā men jiù hěn nán le

我们一旦订交，不管最后发现这些人是多么讨厌，多么无益，要想摆脱他们就很难了。

It is very difficult to shake them of, however irksome and unprofitable they are found, after we have once committed ourselves to them.