But when they cross a busy road by using a zebra crossing, the traffic is held up.
但是当他们利用斑马线通过繁华的马路时，交通就被阻碍了。
2
Boats could carry heavy weights, but canals could not cross hilly terrain; turnpikes could cross the hills, but the roadbeds could not stand up under great weights.
船可以运载重物，但运河不能穿越丘陵地带；高速公路可以翻山越岭，但路基承受不了巨大的重量。
3
The money was soon in the bags and the boys took it up to the cross rock.