请根据提示问题，写一段话介绍深圳的相关情况。要求语句通顺、书写规范。至少5句话。
Tips: 1. Is Shenzhen clean?
2. Are there a lot of trees?
3. Are there many cars and buses on the road?
4. Do people use a lot of plastic bags?
5. What should we do to keep the city clean?