Do you remember where you put the remote control?

He is operating a radio-controlled helicopter.

Underscores are often used in programming.

I bought new underwear.

To measure your underbust size, you measure around the lower part of your chest with a tape measure.

What is this underscore used for?

He ended up in a vegetative state after the accident.

This program is designed to avoid a race condition.

Understanding the transition state of a chemical reaction is important for predicting the progress of the reaction.

The negotiations have fallen into a deadlock.