block curve

例句：

1. 1.The engineer drew a block curve on the graph paper.
   工程师在图纸上画了一条直线。
2. 2.The scientist used a block curve to measure the distance between two points.
   科学家使用一条直线来测量两点之间的距离。
3. 3. The math teacher explained the concept of block curves using a diagram.
   数学老师用一张图来解释块曲线的概念。