Luder's line

例句：

1. 1. The artist used Luder's line to create a beautiful landscape painting.
   这位艺术家使用卢德的线条创作了一幅美丽的风景画。
2. 2. The book is about the history of Luder's line.
   这本书讲述了卢德的线条的历史。
3. 3. The Luder's line was used to mark the boundaries of the garden.
   卢德的线条被用来标记花园的边界。