单词	protoptile
释义	protoptile noun pro·​top·​tile (ˈ)prō¦täptə̇l plural -s : one of the first set of down feathers in young birds having two sets of down Word History Etymology prot- + -ptile
随便看	rowdyisms screw screw anchor screw arbor screw around screw auger screw back screw bell screw bolt screw box screw cap screw cap/top screw conveyor screw coupling screw dislocation screw eye screw fern screw gear screw gearing screw hook screw it screw jack screw joint screw key screw machine

英语词典包含469781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。