Bronze, however, is but a poor substitute for iron and steel, and we maybe very sure that the people who made use of bronze tools knew nothing of iron.
但是，青铜只是钢铁的一种替代品，并且我们可以很肯定的是，使用青铜的人对铁器一无所知。
2
CLT is considerably stronger and more stable than regular wood, and increasingly being introduced as a substitute for steel and concrete.
据说CLT比普通木板材更加坚固和稳定，因此广泛地被应用来替代钢材和混凝土。
3
S. Steel is more likely to be hurt in the long run by substitute products than by its immediate steel company rivals. U.