根据另一种理论，由于金属制造技术的进步，短剑不必再为保持它的强度而刻意造得那么短了。

Another theory is that as metalworking technologies advanced, the gladius no longer had to be short if it wanted to maintain its strength.

youdao

根据另一种理论，由于金属制造技术的进步，短剑不必再为保持它的强度而刻意造得那么短了。

Another theory is that as metalworking technologies advanced, the gladius no longer had to be short if it wanted to maintain its strength.

youdao