an odorless very poisonous gas that is a product of incomplete combustion of carbon
同义词：carbon monoxide??/??carbon monoxide gas??/??CO
a hard ferromagnetic silver-white bivalent or trivalent metallic element; a trace element in plant and animal nutrition
同义词：cobalt??/??Co??/??atomic number 27
one who refuses to serve in the armed forces on grounds of conscience
同义词：conscientious objector??/??CO
a state in west central United States in the Rocky Mountains
同义词：Colorado??/??Centennial State??/??CO
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。