1.Another theory is that as metalworking technologies advanced, the gladius no longer had to be short if it wanted to maintain its strength.
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。
2.By contrast the gladius is very ineffective compared to a large sword when in an open, inpidual, combat.
反过来，在有着广阔空间的单对单的战斗中，短剑则不如长剑有效。
3.I don't think we have any definitive answers as to why and when the gladius goes out of style.
我不认为我们可以就短剑为什么和何时没落下定论。
4.Synopsis of the biology of the swordfish, Xiphias gladius Linnaeus
箭鱼的生物学资料概要