unstiffened type

例句：

1. 1. The unstiffened type ofsteel is stronger and more durable than theregular one.
   这种未加固的钢材比常规钢材更坚固耐用。
2. 2. Thenew model of car hasan unstiffened body, which makes it lighter and morefuel-efficient.
   这款新车采用了未加固车身设计，使得它更轻、更省油。
3. 3. The unstiffenedroof panel can be easily removed for maintenance.
   未加固的屋顶面板可以轻松拆卸进行维护。