魔方是考验智力的小玩具——它蕴含一些数学知识。

And they are clever little toys, I must say – there's some maths in them.

youdao

魔方是考验智力的小玩具——它蕴含一些数学知识。

And they are clever little toys, I must say – there's some maths in them.

youdao