primitive AVO基本视听对象primitiveadj.原始的；简陋的n.文艺复兴前的艺术家；原始人primitive architecture原始社会建筑primitive Christianity原始基督教primitive erythroblast前成红细胞primitive nasal cavity原始鼻腔primitive metalworking原始之金属制造Primitive upper mantle原始上地幔primitive living force原始强力primitive common atrium原始共同心房primitive period system原始周期primitive dental groove[医] 原牙沟

1. It is equired for the formation of the primitive streak during mouse gastrulation.
   它在小鼠原肠期的原条形成过程中起重要作用。