1. a never-ending cycle of activities and events (especially when they seem to have little purpose);

   "if we lose the election the whole legislative merry-go-round will have to start over"
   

2. a large, rotating machine with seats for children to ride or amusement

1.旋转木马
Amerry-go-round is a large circular platform at a fairground on which there are model animals or vehicles for people to sit on or in as it turns round.

2.一连串的相关活动;走马灯似的活动
You can refer to a continuous series of activities as amerry-go-round .

e.g. ...amerry-go-round of teas, fetes, musical events and the like.
一连串的茶会、游乐会、音乐活动以及诸如此类的事情

1. 旋转木马：08.Rainsong 雨之歌 | 09.Merry Go Round 旋转木马 | 10.The Dance 舞曲

2. 初戀拿喳麵：Calmi Couri Appassionati / Reisei to Jounetsu no Aida 冷靜與熱情之間 (2001) | Merry Go Round 初戀拿喳麵 (2001) | Lavender 薰衣草 (2000)

3. 木馬轉啊!轉：35. Little Jack Horner,Little Miss Muffet 小傑克,小默華 | 36.merry-go-round 木馬轉啊!轉 | 37. Shake My Hand 握握我的手

4. 钢水罐回转架：merrillite 陨磷钙钠石 磷钙钠石 |merry-go-round 钢水罐回转架 |merry-go-roundwindmill 转塔式风力发动机