Cách sử dụng
The expression "hammer into" means to make sure someone understands something very clearly and remembers it by repeating it many times or by emphasizing it strongly. It's like using a hammer to pound a nail into a piece of wood, so that it stays put. For example, a teacher might hammer a difficult concept into their students' minds by reviewing it several times or by explaining it in many different ways until everyone understands it well.