If you back the wrong horse, you give your support to the losing side in something.

如果你力挺一批错误的马，你把你的支持给了失利的一方。

Publishers, like other people, sometimes reject chances of backing the right horse, and stubbornly back the wrong one.

像其他人一样，出版商有时拒绝扶植大有前途的作家，而固执地对毫无希望的人大献殷勤。