听力原文：As you know, Wellington Corporation is a global company so we sell our products all over the world. Our best-selling international product is our headphones. We do sell a lot of calculators, stereos, and cell phones, but our headphones really are the star product. Currently, we have sales in thirty-six countries, but we hope to increase that to fifty during the next three years. It's taken a few years to get sales in thirty-six countries, but we're confident that with hard work we won't have too much trouble increasing that number. What is learned about Wellington Corporation?