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	unburied unburies unburnable unburned unburnished unburnt unburrowed unburrowing unburrows unburst unburthened unburthening unburthens unbury unburying unbusinesslike unbusy unbuttered unbutton unbuttoned unbuttoning unbuttons unbuttressed Unc uncage

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。