Cách sử dụng
Haystack is a word used to describe a pile of hay. Hay is a type of grass that is harvested and used as animal feed. A haystack is typically seen on a farm and is usually a large pile of hay that is stacked together. The word haystack can also be used metaphorically to describe something that is very hard to find, like a needle in a haystack. For example, if someone loses their wallet in a big park, they might say "finding my wallet in this park is like finding a needle in a haystack" because it feels like an impossible task.