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：
名词
1. 褥垫;床垫A mattress is the large, flat object which is put on a bed to make it comfortable to sleep on.
1. a large thick pad filled with resilient material and often incorporating coiled springs, used as a bed or part of a bed
多通过句子记忆单词，而不是单独死记硬背。
