This is the 9635th most frequent Japanese word.
背骨
Spine; backbone.
Here, '背骨' is described in a general anatomical sense, explaining its functional importance.
背骨は、人間の体を支える重要な部分です。
The backbone is an essential part that supports the human body.
In this usage, '背骨' is metaphorical, comparing the structure's role in the city to the spine's role in a body.
その建築デザインは街の背骨のようです。
That architectural design is like the backbone of the city.
In this sentence, '背骨' refers to the anatomical backbone (spine), highlighting its physical condition or injury.