https://www.youtube.com/watch?v=7UrqbWF9fJ8 2:07 boy oh boy. you will never get an opportunity to work out what is up, what is down, what is sideways. 上下左右適度な運動をこなせる機会なんてあるもんじゃない。
https://www.youtube.com/watch?v=HdFRqnt6IcA 1:19:44 boy oh boy おやまぁ、、
練習問題解答
b-2571 boy oh boy