听力原文：Woman: The research for a major wildlife TV series can take up to a year, followed by about two years filming, with four or five camera teams around the world at any one time. Finding the right stories to film is only half the job. The other half is finding the right location and then going out to help the camera-person film it. This can be difficult-- you have to make sure you're in the right place at the right time. So good planning is essential. We spend a lot of time on the phone beforehand, getting advice from local experts. You hear a woman talking on the radio about her work making wildlife films. What is her main point?