Smith touches on construction methods, the revolutionary invention of the automatic lift, the practicalities of living in the sky and the likelihood that, as cities become more crowded, apartment living will become the norm.
出自-2013年6月阅读原文
柯林斯高阶英汉双解学习词典释义
N-VAR
实际方面；实际情况
The practicalities of a situation are the practical aspects of it, as opposed to its theoretical aspects.