He was opposed to the project at first, but then he changed sides and voted in favor of it.开始时他反对这个工程，但后来他改变立场投了赞成票。The teams change sides at half-time.两队在中场休息时交换场地。It's quite rare for politicians to change sides.很少有政客会投奔对方营垒。She has since changed sides on that issue.她后来在那件事情上改变了立场。