Generally a number of rolling passes are required in the whole process, because the metal must be reduced gradually to the final shape required.

一般说来，整个轧制过程要经过许多道次的轧制，因为金属必须经过逐步压缩，才能得到最后所需的形状。

youdao

Generally a number of rolling passes are required in the whole process, because the metal must be reduced gradually to the final shape required.

一般说来，整个轧制过程要经过许多道次的轧制，因为金属必须经过逐步压缩，才能得到最后所需的形状。

youdao