There were so many important things in this lecture that I couldn't stop taking notes the whole time I was told. It wasn't that hard to express young children, teenagers, and people in their 20s and 30s because they were in their 20s and 30s, but I didn't have many opportunities to express them with my voice, so I thought it wasn't easy. If I practice hard, I'll improve my ability to express older people, right? I thought I should practice harder.