Cách sử dụng
The word 'cornerstone' is often used to describe something that is essential or important to the foundation or structure of something else. It can be used in a literal sense to describe a actual stone that is the first one laid in the foundation of a building. Figuratively, it can be used to describe a key element or principle that is necessary for the success or growth of something, such as a business or community. For example, teamwork might be considered a cornerstone of a successful company.