hobbyhorse

详细解释:n. 摇动木马, 竹马, 反复讲的话题, 老调重弹

英语解释：

名词 hobbyhorse:

a topic to which one constantly revertsa child's plaything consisting of an imitation horse mounted on rockers; the child straddles it and pretends to ride同义词：hobby, rocking horse