My grandmother moves around the room using a walking frame.

I bought a new atomizer.

I took the car to the repair shop to install a new on-board device.

This amplifier improves the sound quality.

He planted a bug in the room.

My sense organ recognized his voice immediately.

This resistor is used to control the current.

This transformer is necessary for power supply.

The telephone transmitter is broken, and my voice doesn't reach the other person.

He used a syringe to inject the medicine.