点击下方单词,选择对的这个单词
点击下面链接下载与本句相关的学习资源，包括PDF教材和音频练习，方便课后复习：
1. (著作、讲座、电影或绘画的)主题，题材，主要内容The subject matter of something such as a book, lecture, film, or painting is the thing that is being written about, discussed, or shown.
1. what a communication that is about something is about
Synonym: messagecontentsubstance
多通过句子记忆单词，而不是单独死记硬背。
