Cách sử dụng
The expression "how long is a piece of string?" is often used to describe a situation where there is no clear or definite answer. It is used when someone asks a question that cannot be answered with a specific measurement or amount. For example, if someone asks "how long will it take to fix my car?", the answer is not clear because it depends on what is wrong with the car. So, someone might respond with "how long is a piece of string?" to indicate that there is no set answer.