1. 释义：the basic part of something,on which everything depends
2. 理解：cornerstone本意是建筑中的“基石”，常被用作比喻事物的基础。当我们想表示"the foundamental/basic part of something"，就可用到更形象简洁的 cornerstone。
cornerstone的类似常见表达：building block/bedrock/foundation
3. 应用：
1）翻译：人工智能技术正在成为日常生活中重要的一部分。
Artificial intelligence technologies are becoming cornerstones of our daily lives.
2）造句
Curiosity, creativity, and the ability to perceive happiness are cornerstones of success.(好奇心、创造力和感知幸福的能力是成功的基石。）
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