Exactly what it say....there is no other meaning. The word for the world/streets is each one teach one...everyone has a gift in something and it is for us to teach one another to bring about a common goal. The goal for Eph. 4:11-13 is to bring sinners to the knowledge of Christ. There are so many people who don't know about the Lord and it is up to the ones that do know to bring it to them. In saying that...see we have so many different religions (christianity/buddism/muslims/jehovah witnesses) etc. They all have their beliefs and doctrines, but eventally they all end up knowing about Jesus Christ...knowing about the Lord, albeit erroneous in some instances, but then that is where study to show THYSELF approved comes in.