M line

例句：

1. 1. The artist drew a beautiful M line on the canvas.
   艺术家在画布上画了一条美丽的直线。
2. 2. The designer used a M line to create a modern look.
   设计师使用一条直线来创造一种现代感。
3. 3.The ruler is marked with a M line for easy measurement.
   直尺上有一条线标记，方便测量。