linear stream

例句：

1. 1. The line of the road is straight as an arrow.
   这条道路线直如箭。
2. 2.The linear growth of the population is a concern for policymakers.
   人口的直线增长是政策制定者关心的问题。
3. 3. The linear programming problem is a classic example of optimization theory.
   线性规划问题是一个优化理论的经典例子。