He discreetly swapped my wallet.

He is a world-renowned ichthyologist.

The calculus of variations is a branch of mathematics that deals with the optimization of functions.

He is studying at law school.

The fire alarm went off, so we immediately evacuated the building.

A tsunami warning has been issued, so please evacuate immediately.

This restaurant has an all-you-can-eat sushi.

A visitor has come.

I attend psychotherapy sessions every week.

Next month, I will apply for a visa for my visit to China.