linear beam density

例句：

1. 1.The data is presented in a linear format.
   数据以线性格式呈现。
2. 2. The road follows a linear path through the valley.
   这条路沿着山谷的直线穿过去。
3. 3. The book is written in a linear style.
   这本书是以线性风格写的。