How many times have you sung that song?

He has read thousands of books.

What floor is the library on?

How many times have you been to Japan?

This diode only allows current to flow in one direction.

The vas deferens is a part of the male reproductive system and has the role of transporting sperm.

This old radio uses a vacuum fluorescent display.

He is mindful of healthy eating and exercise to reduce the risk of cardiovascular disease.

This old radio uses a pentode.

This old radio uses a cold-cathode tube.