Can I throw away the knife I bought on a trip after a long time?

You can throw it away if you don't like it.

Tool is a tool used for cutting in mechanical manufacturing, also known as cutting tool. Most knives are used by machines, but some are used by hand. Because the tools used in mechanical manufacturing are basically used to cut metal materials, the word "tool" is generally understood as a metal cutting tool. Tools for cutting wood are called woodworking tools. There is also a special type of tool used in geological exploration, drilling and mine drilling, which is called mine tool.