primer
/ˈpraɪmə(r); `prɪmɚ/ n
(dated 旧) textbook for people just starting to study a subject 初级读本; 入门书
a Latin primer 拉丁文入门.
primer / ˈpraɪmə(r); `praɪmɚ/ n
1 [U, C] substance usedto prime3(2) a surface for painting （上油漆用的）底层涂料, 底漆.
2 [C] amount of explosive in a smallcontainer used to explode the main charge of gunpowderin a cartridge, bomb, etc 底火; 火帽; 点火药.