英语翻译大约过了半个小时,他才平静下来(用上clam down)当在街上散步时,他碰见了他的老朋友TOM(用上while doing)

1.He didn't calm himself down until halt a hour or so had passed
2.He met his old friend Tom while walking in the street.

1.he finally calmed himself down after half hour.
2.He encounterred Tom who was his old friend while walking in the street