It's very difficult to find the way in a whiteout.

This is my first question.

His actions are always enigmatic, making it difficult to understand.

I wonder what this bento's mystery meat is made from.

I'm thinking about what to give my girlfriend for White Day.

There is a large whiteboard in my office.

I added your email address to the whitelist of my computer.

The problem of space debris could potentially have a significant impact on future space development.

The study of cosmic rays may hold the key to unraveling the mysteries of the universe.

He proposed a new theory about cosmology.