A revolving door typically consists of three or four doors that hang on a center shaft and rotate around a vertical axis within a round enclosure. Revolving doors are energy efficient inasmuch as they prevent drafts, thus preventing increases in the heating or cooling required for the building.[1] At the same time, revolving doors allow large numbers of people to pass in and out.
2 Smoke came out off the a/c.
3 There are many sharp curves on this road.
4 Twist the cap clockwise until you hear multiple clicks, to verify it is locked properly.
เอามาจากนี้เลย http://www.ehow.com/how_5051632_open-locking-gas-cap.html
5 Powder is tipped all over that car.
6 He drove in the reverse direction.