An electrooculogram is a test method to record the movement of the eyeball.

He measured muscle activity using an electromyograph.

The doctor used an electrocardiograph to check the condition of my heart.

I examined muscle activity using an electromyogram.

He searched for a flashlight in the darkness.

We should always remember the power of Kannon in difficult times.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.