这是什么用英语怎么说

"What is this for?"

This phrase is used to ask about the purpose or function of something. It is a common question in English, especially when someone is unfamiliar with the object being discussed. The word "this" refers to a specific item or thing, while "for" indicates the reason or intention behind its use.

Example: If someone shows you a new gadget, they might ask, "What is this for?" to find out what it is intended to do. Similarly, if you see someone using a strange tool, you might ask, "What is this for?" to learn more about its functions.

In conclusion, "What is this for?" is a simple yet useful phrase that can help people understand the purpose of various objects and tools. By asking this question, we can gain valuable insights into how things work and how we can use them more effectively.