淬硬工具钢。
我们可把铁与钢相比，然后决定哪个更硬些。
借助于科学技术，玻璃可以被制作的像钢一样硬，像丝一样柔，像纸一样轻，像铁一样重。
With the help of the science and technology, glass can be made as hard as steel, or as soft as silk, or as light as paper, or as heavy as iron.
钢比木头硬。
钢虽硬，但在强力作用下也会弯曲或断裂。
Hard as steel is, it will bend or break under the action of a strong force.
钢虽硬，但在强力作用下也会弯曲或断裂。
Hard as steel is, it will bend or break under the action of a strong force.
应用推荐