He was hiding the fact that he was an illegitimate child.

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.

She always says 'the lady doth protest too much,' seeming to deny his actions, but in reality, she loves him very much.

I borrow new books from the library every week.

I can't find my birth certificate.