hobby horse
noun
1
- a child's toy consisting of a stick with a model of a horse's head at one end（供儿童骑着玩的）马头杆。
1.1
- a rocking horse摇马。
1.2
- a model of a horse or a horse's head, typically of wicker, used in morris dancing or pantomime马形（或马头形）饰物（尤指枝条编成, 用于莫利斯舞蹈或哑剧表演）。
2
- a preoccupation; a favourite topic使人全神贯注的事; 喜欢的话题：
scientific visualization is another of his hobby horses.
科学想象是又一使他入迷之事。