But a spiral burrow takes the design a step further, by helping to block airflow.

但是螺旋形洞穴通过帮助阻挡气流使设计更进一步。

Trevelyan has said, " From Tudor times onwards, England treated European politics simply as a means of insuring her own security from invasion and furthering her designs beyond the ocean" .

Trevelyan 曾说过，“从都铎王朝时代开始，英国将欧洲政治简单地视为一种手段，以确保其自身安全免受入侵，并将其计划推进到海洋之外”。