primary side

例句：

1. 1. The car's frontis the primary side.
   汽车的前部是主侧边。
2. 2. The book has a primaryside with illustrations.
   这本书有一个带有插图的主侧边。
3. 3. The painting has a primaryside that shows the landscape.
   这幅画有一幅展示风景的主侧边。