The Oniwaban was in charge of information gathering and security during the Edo period.

The deathwatch beetle is known for eating wood.

This is just a rehashed idea.

He searched for a flashlight in the darkness.

The photoelectric effect is a phenomenon where a material emits electrons after absorbing light.

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

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

He measured muscle activity using an electromyograph.

I examined muscle activity using an electromyogram.

He thought he was smart, but he remembered the proverb 'a fool may give a wise man council', and understood the importance of listening to others' opinions.