听力原文： Sydney is situated on the foreshores of one of the most magnificent harbors in the world. It was founded in 1788 and with a population of over 3 million. It is the largest city in Australia. Authors have described it as fascinating, bustling, sophisticated, colorful, exciting. Its distinction lies in its wealth of natural beauty, which coupled with its temperate climate provides ideal facilities for outdoor life unparalleled anywhere in the world. Its 54 km2 of protected harbor waters, its many narrow winding streets which have followed the bullock tracks of early days, and its golden sands and glorious surfing beaches give infinite variety and endless interest to visitors. Its people are friendly and have an exuberance which expresses itself in sport, the arts, and politics. A dominating landmark is the harbor bridge, whose arch is some 134 m above water level. It is just under 5 km long, and provides the main traffic link between the city and her northern suburbs. An exciting addition to Sydney's charm is the Opera House which is magnificently situated at Bennelong Point overlooking Sydney Harbor. What is the population of Sydney according to the passage?