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。
2
I'll give you one pound an hour, if you will carry a brick under your arm and walk around the square for five hours without stopping.
如果你能在胳膊下夹着一块砖头，在广场上不停地走五个小时，我给你每小时一英镑。
3
Under this Act, all waterfowl hunters 16 years of age and over must annually purchase and carry a Federal Duck Stamp.