Online appearance model的用法和樣例：
例句
- Online study groups were available where she could collaborate with other students via listserv and instant messaging.
也有在線學習群，她可以通過郵件列表和即時通信與其他學生協作。 - Based on the discussion on learning control method, control model learning in AHS, particular in the important and necessity of online learning, is analyzed.
在討論了學習控制研究方法和水平的基礎上，分析了自動公路系統中控制模型引入學習，尤其是在線學習的重要性和必要性。
