common downcomer

例句：

1. 1. 公共的，常见的
   形容词
2. 2.向下倾斜的人或物
   名词
3. 3. 向下倾斜
   动词
4. 1. The common downcomer is a common sight in the park.
   公园里常见的下坡是一道常见的景象。
5. 2. The common downcomer has been causing problems for many years.
   常见的下坡已经给许多年来造成了问题。
6. 3. The common downcomer was used to guide people down from the hill.
   常见的下坡被用来引导人们从山坡下来。