Day 53
释义：n. the basic part of something, on which everything depends
=building block=foundation=bedrock
例句：
1-Trust, love, and mutual respect are cornerstones of marriage.
2-What do corporate leaders do all day? Much of their time is spent in meetings. No wonder: meetings are, among other things, the cornerstone of teams, which in turn are the basic building blocks of corporate existence.
练习
1-翻译：人工智能技术正在成为日常生活中重要的一部分。
→AI technology is becoming the cornerstone of our daily life.
参考翻译：
Artificial intelligence technologies are becoming cornerstones of our daily lives.
2-造句
场景：耐心是深度学习中很重要的一部分。
Patience is the cornerstone of deep learning.
