英语语法分析

Behind their ditches, they were building catapults, scorpions, tall trebuchets.

在他们的渠后，他们正建造着，蝎子机，高高的投石机。

Behind their ditches, they were building catapults, scorpions, tall trebuchets.

在他们的渠后，他们正建造着弩炮，蝎子机，高高的投石机。