The summer vacation ended in the blink of an eye.

It's hard to say, but I think you're wrong.

He always used to say, 'It's easy to say, but hard to do.'

He is good at expressing his feelings well.

He openly declares that he is an atheist.

He is majoring in phonology at university.

He likes to take a walk in the park at dusk.

He identifies himself as an atheist.

Phonology is a branch of linguistics that studies the system of sounds and their functions.

Acrylamide is a type of chemical, especially used in the manufacture of plastics.