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It is based on a 1938 incident A true story in Austria: Maria, a novice nun, was a cheerful and enthusiastic girl. She loves to sing and dance, and also loves the freshness and tranquility of nature. But the abbess felt that Maria was not suitable for this kind of life isolated from the world, so she came to Salzburg and became a tutor for the 7 children of the von Trapp family, a former retired officer of the Austrian Imperial Navy. During this period, Maria was concerned about what the children were doing as they grew up, and soon became their close friend and established a deep relationship. She taught seven children to practice chorus together and established a well-educated family choir. This aroused the colonel's love for life and also aroused his love for Maria, and they formed a happy partner. This was the eve of Hitler's preparations to annex Austria in the 1930s. The Nazis had already smelled the strong smell of freedom in the colonel's home and ordered him to return to the navy immediately. His family was also under surveillance. In the end, Maria cleverly used the folk festival to With the opportunity, and with the help of nuns and friends, the family escaped from the troubled motherland.