primary simple drawing

例句：

1. 1. The primary goal of the projectis to improve efficiency.
   该项目的首要目标是提高效率。
2. 2.The basic principles of physics areuniversally accepted.
   物理学的基本原理被普遍接受。
3. 3. The essential ingredients for making a cakeare flour and sugar.
   制作蛋糕的基本原料是面粉和糖。