Cách sử dụng
The word 'linchpin' is used to describe something or someone that is very important to a certain situation or system. It is like a small piece that holds everything together. For example, in a company, the CEO might be the linchpin who keeps everything running smoothly. In a machine, the linchpin might be the small piece that keeps all the other parts in place. It is an important part, without which everything else might fall apart or not work properly.