军事学
伞兵援救
They are a mixture of Green Berets, Rangers and the Delta Force from the Army, the Seals (which stands for Sea-Air-Land) from the Navy and the Air Force's combat controllers and para rescue teams.
BBC: Snipers
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。