英语单词顺位问题?within句子中的位置,请举例说明

1“范围内”
there is no shop within 3 miles of the house
屋子的三里范围内没有商店 within my reach 我够得着的范围之内
2within是在...之内;在内部.
例如:Within 3 days,he will arrive here.
within doors
在屋内
within oneself
在心里
within five days
五天之内
remain within reach(call,hearing,sight)
留在附近(叫得应,听得见,看得到的地方)
live within one's income
量入为出
keep it within bounds
保持在限制范围内
By the use of X rays,doctors can see within the body.
医生用X光可以看到人体内部.
He lives within 20 minutes'walk.
他住的地方走20分钟就到.