active optical network

例句：

1. 1. The team is active in promoting environmental protection.
   该团队积极推广环境保护。
2. 2. The new project is active and has already attracted many investors.
   新项目积极进行，已经吸引了许多投资者。
3. 3. The students are active in participating in extracurricular activities.
   学生们积极参与课外活动。