SFL

例句：

1. 1. The SFL is a popularonline platform for learning languages.
   SFL是一个受欢迎的在线学习语言的平台。
2. 2. The SFL has been providing languagelearning resources for over 10 years.
   SFL已经提供语言学习资源超过10年了。
3. 3. The SFLoffers courses in various languages, including English, French, and Spanish.
   SFL提供各种语言的课程，包括英语、法语和西班牙语。