firstaidadj.急救的firstadj.第一的；最初的adv.首先；第一n.最初；(序数词)第一first feeding饷食first initial头一个字母first address首地址first-grade甲级first refusal优先取舍权first chop.一级first winding初级绕组first-classadj.头等的；上等的adv.头等地first perfect第一完成式first incisor中门齿, 中牙切