five-step packaging development method

• 五步法

five-step packaging development method的用法和样例：

例句

1. Now Five-Step method or Six-Step method was usually used package design, they all need to define the fragility and damage boundary.
   摘要现在设计产品的运输包装广泛采用五步法或六步法，这其中都要确定产品的脆值，都要用到破损边界理论。