The launch of intercontinental ballistic missiles has become an international issue.

I studied Classical Chinese in university.

He became a wealthy person by succeeding in business.

What does this sign mean?

This system is too irrational to understand.

I am surprised at the irrationality of this system.

I saw a flamingo in the park.

He started writing a song on the staff notation.

He sent a message using Morse code.

He is writing a paper on coding theory.