n.溜溜球(一种线轴般的玩具)( yo-yo的名词复数 );
例句:
Are they playing with yo-yos? No, they aren't. They are running.
他们正在玩溜溜球 吗 ?不, 他们不在. 他们正在跑步.
How many yo-yos are there?
有几个溜溜球?
There are six yo-yos.
有六个溜溜球.