单词	oxygen mask
释义	oxygen maskˈoxygen mask noun [countable] a piece of equipment that fits over someone’s mouth and nose to provide him or her with oxygen
随便看	one-size-fits-all one-stop onetime one-to-one one-track mind one-two one-up one-upmanship one-way one-way mirror one-woman ongoing onion onion dome onion ring online onlooker only on-off onomastics onomatopoeia onomatopoeic Onondaga on-ramp onrush

英语词典包含48224条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。