YOU SAID:

Exactly why Dudley wanted a racing bike was a mystery to Harry, as Dudley was very fat and hated exercise unless of course it involved punching somebody.

INTO JAPANESE

ダドリーがなぜレーシング バイクを欲しがったのかは、ハリーには謎でした。ダドリーは太っていて、もちろん誰かを殴る以外は運動が嫌いだったからです。

BACK INTO ENGLISH

It was a mystery to Harry why Dudley wanted a racing bike. Because Dudley was fat and hated exercise, except of course hitting someone.

INTO JAPANESE

なぜダドリーがレーシングバイクを欲しがったのか、ハリーには謎だった。ダドリーは太っていて、もちろん誰かを殴る以外は運動が嫌いだったからです。

BACK INTO ENGLISH

It was a mystery to Harry why Dudley wanted a racing bike. Because Dudley was fat and hated exercise, except of course hitting someone.