Cách sử dụng
The word 'efficacious' means something that is effective or successful in achieving a desired result. It can be used to describe a medicine that has been proven to cure a particular illness or a plan that has been effective in achieving a certain goal. It is a strong and formal word that is usually used in more professional or academic contexts. For example, a doctor might use the word efficacious to describe a successful treatment, or a scientist might use it to describe a successful experiment.