I am studying natural language processing at university.

He answered in a disconcerted manner to the sudden question.

The atomic weight of helium is 4.

He was angry like a field set ablaze.

For my health, I started reducing the amount of my daily meals.

He decided to decrease the amount of his meals for his health.

Understanding the rules of 'Ha-gyou tenko' is difficult.

I bought new underwear.

He passed the practical skills test.

We made a resolution about that issue.