例句與造句

1. One major customer introduced the use of flat steps replacing the earlier tubes, a feature that is now almost universal.
2. Although stepladders had been in use for many years before 1862, his primary contribution to safety was the replacement of round rungs by flat steps.
3. In 1988, Australian egyptologist David O'Connor discovered a square, flat mount made of fine limestone rubble, covered with mud-bricks and forming four flat steps.
4. A similar device with flat steps is occasionally used as an elevator for humans, e . g ., for employees in parking garages . ( This sort of elevator is generally considered too dangerous to allow use by the public .)
5. It's difficult to find flat steps in a sentence. 用flat steps造句挺難的