stepless canal

例句：

1. 1. The engineer designed a stepless canal to divert the water from the river.
   工程师设计了一个无级导流槽，将河水引向河中。
2. 2. The new stepless canal will greatly improve transportation in this area.
   新的无级导流槽将极大地改善该地区的交通。
3. 3. The construction of the stepless canal was completed ahead of schedule.
   无级导流槽的建设提前完成。