Cách sử dụng
The word 'keystone' can refer to an important part or element of something. It is commonly used in architecture, where a keystone is a wedge-shaped stone at the top of an arch that locks all the other stones in place. In other contexts, 'keystone' can mean a crucial or central part of a system or organization. For example, in a team, a keystone player may be one who is essential to the success of the team. Overall, 'keystone' is used to convey the idea of something essential, foundational, or critical.