工具 (gōng jù): tool, instrument

This small knife is a tool my dad gave me; I use it to sharpen pencils and cut fruit, and it's very convenient.

For a car mechanic, a wrench and a screwdriver are tools that must be used every day.

The teacher told us that a dictionary is an important tool for learning Chinese; when you come across a character you don't know, you should look it up immediately.

With the development of technology, a mobile phone is not only a communication tool; it can also be used for payments, navigation, and taking photos.

In a first-aid kit, bandages and disinfectant are indispensable tools; at a critical moment, they can save a life.