Cách sử dụng
The expression "how, why, etc. in the world" is usually used when someone is surprised or confused about something. For example, if someone tells you that they saw a movie with a really bad actor, you might ask "how in the world did you sit through that?" This means that you are surprised that they managed to watch the movie, even though it had a bad actor. The expression can be used in different situations, but usually it is used to express surprise or confusion about something. It is a casual expression, so you wouldn't use it in a formal setting, like a job interview or a business meeting.