Often, these structures are not up to modern building codes and require extensive updates to ensure their safety and functionality.

通常，这些结构不符合现代建筑规范， 需要进行大量更新以确保其安全性和功能性。

Apprenticeships were altogether unknown to the ancients. The reciprocal duties of master and apprentice make a considerable article in every modern code. The Roman law is perfectly silent with regard to them.

学徒制对古人来说是完全未知的。师徒之间的相互义务在每一个现代法典中都占有相当大的地位。罗马法律对他们完全保持沉默。