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. (陆军、空军或海军陆战队的)上校A colonel is a senior officer in an army, air force, or the marines.
1. a commissioned military officer in the United States Army or Air Force or Marines who ranks above a lieutenant colonel and below a brigadier general
多通过句子记忆单词，而不是单独死记硬背。
