navigation aid短语¹⁴⁴⁹⁷²⁺² 基本例句 导航系统 The republican international system info will be the navigation world human history philosophy ethics navigation aid! 共和国际理论体系将是领航世界人类史的哲学伦理航标！ ifeng Maritime Navigation Aid System is the important part of Maritime Traffic Safety Guarantee System. 海上航标系统是海上交通安全保障体系的重要组成部分。 cnki