gyroscope

It's a toy I used to play with when I was a kid.How to play: Take a long piece of string and wrap it around, then grab the handle with one hand and pull out the end of the string with the other hand, and you can make it spin.这是我小时候经常玩的玩具。 玩法：拿一根长绳子缠绕起来，然后一只手抓住长柄，另一只手抽出绳子的一端，就可以让它旋转起来。