Just as an oyster shell protects life within, Dubrovnik's walls nurtured a flourishing maritime republic that once rivaled Venice.

就像蚝壳保护内在生命体一样，杜布罗夫尼克的城墙孕育了欣欣向荣的海边共和国，一度足以媲美威尼斯。

In the 12th century, the wealthy maritime republic of Pisa set about turning its cathedral square into a magnificent landmark.

在12世纪，富裕的比萨海洋共和国开始将其大教堂广场变成一个宏伟的地标。