cofferdam
noun [ C ] engineering specialized uk/ˈkɒf.ə.dæm/ us/ˈkɑː.fɚ.dæm/
（用于水下工作的）潜水箱，沉箱
a large box filled with air that allows people to work underwater, for example while building bridges
英汉双解词典收录81607条英汉双解翻译词条，基本涵盖了全部常用单词的读音、翻译及用法，是英语学习的有利工具。