Cách sử dụng
A hopper is a container or machine that is used to store or move materials such as grain, sand, or gravel. It usually has a funnel-like shape at the top and may have openings or outlets at the bottom. People often use hoppers in construction, manufacturing, and agriculture. For example, a cement mixer might have a hopper where workers can add sand, cement, and water to make concrete. Or a farmer might use a hopper to store and distribute animal feed.