Cách sử dụng
The word 'quack' can be used to describe someone who pretends to have medical knowledge or skills that they do not actually possess. This can be a harmful thing, as it means they may try to give people advice or treatments that could be ineffective or even dangerous. For example, if you see someone advertising a "miracle cure" for a serious illness, but they don't actually have any medical training or qualifications, they might be described as a "quack". It's important to be cautious and to check the credentials of anyone offering medical advice or treatments, to avoid falling prey to quackery.