A 16th-century enclosed bridge in Venice between the Doges' Palace and the state prison, originally crossed by prisoners on their way to torture or execution.
叹息桥（16世纪意大利威尼斯的一座封闭式桥梁，两端是总督府和监狱，因当时囚犯要过此桥去受刑而得名）
Definition of Bridge of Sighs in US English:
Bridge of Sighs
proper nounˈˌbrij əv ˈsīz
A 16th-century enclosed bridge in Venice between the Doges' Palace and the state prison, originally crossed by prisoners on their way to torture or execution.