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. a wheeled vehicle adapted to the rails of railroad
e.g. three cars had jumped the rails
Synonym: carrailway carrailroad car
多通过句子记忆单词，而不是单独死记硬背。
