round and round neck and neck back and 三个都是短语吗?是固定搭配?

round and round 转了一圈又一圈
neck and neck 不相上下
back to back 紧接着

round and round ad. 处处
neck and neck ad. 并驾齐驱
back and back 没有这个词
back to back: 连续,紧接
back to back L-C: 背对背信用证

round and round 一圈圈
neck and neck 肩并肩
back and back 来来回回
是短语
是固定搭配

round and round
旋转不息地
neck and neck
并驾齐驱