An early primer consisting of a single page protected by a transparent sheet of horn, formerly used in teaching children to read.
角帖书一种早期初级读物, 即为一张盖有透明角片作为保护的书页, 以前供儿童认字用
Children learn knowledge from primers.
孩子们从启蒙书上学习知识。
A coat of primer should be made over the bare surface before the main painting.
在喷涂主漆前, 应在物品的表面刷一层底漆。
