This development of a gas-filled, chambered shell, also known as a phragmocone, was a triumphant, history-making adaptation.

这种充满气体的腔壳（也称为 phragmocone）的开发是一项成功的、创造历史的改编。

While the old gas-filled phragmocone couldn't withstand the pressure of the deep ocean, the gladius had no such problem.

虽然旧的充气 phragmocone 无法承受深海的压力，但 gladius 没有这样的问题。