yo yo

n.

溜溜球（一种线轴般的玩具）；优柔寡断的人；〈美俚〉蠢人，笨人；

adj.

上下起落的；摇摆不定的；

v.

玩约约；忽上忽下；

复数：yo yos

1. The teacher threatened to confiscate their Yo Yos if they kept playing in class.
   老师威胁说，如果他们在上课时继续玩就没收他们的溜溜球。
2. Set knowledge, interest and entertainment with a convenience simple, but is free yo.
   设置一个方便简单的知识，兴趣和娱乐，但是是免费的溜溜球。

Yo-yo
Yo-yo
Yo-yo
The yo yo intermittent recovery test: physiological response, reliability, and validity.
The Yo-Yo intermittent recovery test : a useful tool for evaluation of physical performance in intermittent sports
The Yo-Yo IR2 test: physiological response, reliability, and application to elite soccer
Aerobic fitness and yo yo continuous and intermittent tests performances in soccer players: a correlation study.
The Yo-Yo Intermittent Recovery Test
Direct validity of the yo yo intermittent recovery test in young team handball players.
Oscillatory neural networks for robotic yo yo control
Toy yo yo with selective enhanced rotation
Oscillatory neural networks for robotic yo yo control
The SCAAR registry or the Swedish yo yo