For weeks I had envied this woman and her way of life, while I had been able to walk three miles to our car!

我能够从三英里外走到车子这儿来，然而这几个星期以来我一直在妒忌这个女子，妒忌她的生活。

youdao

"And in the evening, I usually run or walk for three or four miles a day."

VOA: standard.2010.07.16

Resembling a small child wearing an astronaut outfit with a backpack (for the battery power source), the ASIMO could walk on two feet at speeds at over three miles per hour.

FORBES: Reflections on Personal Robots, Backwards and Forwards