The main take-away from the lecture was a deeper understanding of climate change.

take-away 是复合名词，由动词短语 take away（带走）转化而来。在学术或商业语境中，take-away 指"从会议、演讲或讨论中获得的主要观点或收获"，可以理解为"要点、核心收获"。