Cách sử dụng
The expression "send in" is used to indicate that something is being submitted or sent to a particular person or place. It is often used in the context of completing an application or sending a message to someone. For example, you might say "I need to send in my resume to apply for the job" or "I'm going to send in a request to customer service." Essentially, whenever you want to communicate that you are sending something to someone or a place, you can use the expression "send in."