n.功课( lesson的名词复数 );课程;教训;一堂课;
例句:
This is one of the most valuable lessons I learned.
这是我所学到的最宝贵的教训.
She's having singing lessons.
她在上声乐课。
The company failed to learn any lessons from this experience.
公司未能从这次经历中吸取任何教训。