初小的英文：
primary grades
adj. 初级的；基本的；最早的，原始的；原生的；首要的，主要的
n.，首选；候选人初选会；预选；原色
primary feather
初级飞羽
A primary feather of a bird.
翅前羽鸟的初级飞羽
The Democratic primary was held this month.
民主党候选人初选于本月举行。
These are created by combining the primary.
这些颜色通过混合原色形成。
This should be your primary concern!
这一点是首先需要留心的。
n. 年级；阶段；等级
v. 将…按级别分类；给…批分数，改作业；混合
longitudinal grade
纵坡度
There are lots of jobs in junior grades.
初级阶段有很多工作要做。
Red grades into pink.
红色逐渐变成粉红色。
The teachers are grading the papers.
老师们正在给卷子打分数。
Pencils are graded according to softness.
铅笔根据硬度分类。