Good morning, ladies and gentleman. Welcome to Beijing, China. I’m Cindy, from China International Travel Agency.It’s very happy to be your English tour guide here. Now let me make a brief introduction about our one-day tour plan for you.In the morning, we’ll start the day at the Great Wall, an excellent place to know the history of China. He who doesn’t reach the Great Wall is not a true man. At noon, we will enjoy the delicious local food Beijing Roast Duck. In the afternoon, we will visit the Summer Palace (颐和园),which is a royal （皇家的）garden. It’s an interesting place to relax yourselves. Finally, in the evening, we’ll enjoy Beijing Opera. Once you are in Beijing, it is a must-do.
What’s the meaning of the underlined sentence “He who doesn't reach the Great Wall is not a true man.” on the third paragraph?