“两侧的”用英语怎么说？

我们经常看到在乡村路的两侧的沟渠.We often find ditches on the sides of country roads.它与两侧的加数移位的可约性有关.It has to do with the reducibility of two - sided weighted shifts.月亮已经把两侧的高地照得亮堂堂的.Already the moon shone quite clear on the high groun...