At the end of The Sound of Music, what do two nuns mean when they say they made a mistake and then take out the microphone?

What the nun took out was not a microphone, but a car part, an ignition part, which was used to start the car.

The Sound of Music is a musical film directed by robert wise and starring Julie Andrews and christopher plummer. It was released in Britain on March 29th, 1965.

The film tells the story that Sister Maria went to Colonel trapp's house as a governess, and soon became one with the colonel's seven children. Under the guidance of Maria, the colonel gradually changed his attitude towards the children and developed feelings with Maria. This film won five awards at the 38th Academy Awards, including best film and best director.

Introduction:

Maria (Julie Andrews), a 22-year-old nun, grew up in Salzburg Abbey. However, her lively and nature-loving personality always got her into trouble in the monastery. Abbey Dean Ebis (Peggy Wood) thinks that her lively personality is not suitable for the life of a nun. So, when she received a request from Colonel Feng Te Rapp (christopher plummer) for care, she decided to let Maria go so that she could explore the real purpose of life.