he got the idea for his business while walking through a park.
as older worker said, the truth is that this job keeps me satisfied with my life.

for은 여기에서 왜 쓰였나요 ? 해석을 어떻게 하죠 ?
그리고 as는 어떻게 해석을 해야 하나요 ?? ~할때 ??
빠르고 친절한 답변 부탁드릴께요 .