求翻译：上海地处长江三角洲前缘，正当我国南北海岸线的中部，地理位置优越。这里平均海拔高度为4米左右，属热带季风气候，四季分明，日照充分，雨量充沛。中国第三大岛崇明岛就在上海。是什么意思？

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Haiti is on the Yangtze River Delta Region 3, at the leading edge of the north central coast, in a central location. There is an average altitude of 4 meters, is a tropical monsoon climate, 4 distinct seasons, abundant rainfall and sunshine. The 3 large islands on Chongming Island in Shanghai.

Shanghai is situated at the Yangtze River delta front, while our country north and south coastline middle, the geographical position is superior.Here average altitude above sea level is about 4 meters, is the tropical monsoon climate, the four seasons is distinct, the sunshine is full, the rainfall

Front of Shanghai is located in the Yangtze River Delta, China's North and South coastline of Central and strategic location. Here the average height is about 4 meters above sea level, is a tropical monsoon climate, seasons, full of sunshine and abundant rainfall. China's third largest island Chongm