unequal span

例句：

1. 1.The bridge has an unequal span, which makes it difficult to cross.
   这座桥的跨度不等，过桥很困难。
2. 2.The project is designed to achieve an unequal span of development between the two regions.
   该项目旨在实现两个地区发展的不等跨度。
3. 3. The unequal span of the road means that cars have to drive at a slower speed.
   道路的不等跨度意味着汽车必须以较慢的速度行驶。