21, this is the number of strings in the traditional Chinese instrument Guzheng, which is a complicated number for a girl who was 4 years old, and it is difficult to play this instrument, but I have persevered for 10 years, and I think I will continue to do so in the future. My instrument, also accompanied me from China across the ocean to the United States. Now, I not only insist on learning Guzheng, I also use music to spread culture, to heal others. I united a few Chinese instrument lovers formed our own band, the name is BTI Silk & Bamboo Chinese Orchestra, we often go to the community, old people's homes, churches, schools to perform, so that more people understand Chinese culture, bring them unique music appreciation, bring them happiness and joy, these give me a lot of encouragement. Thanks to Guzheng, I have exercised my perseverance, and also allow me to spread culture through music, making me a small envoy of cultural exchanges between China and the United States.