英语语法分析

Airlift tipped the balance of the sieges.

空运扭转了围攻战的战局。

The impact of the airport sieges is spreading by the day.

机场被围困造成的影响正在一天天扩大。

However, the Guardians proved impossible to defeat except by massed attacks and seemingly endless sieges.

然而，那些曾经证明是不可战胜的守护者机器人最终在无休止的大量攻击面前败下阵来。