He was surprised to find a beetle.

Kunminjōon is a book for teaching the correct pronunciation of Hangul.

Infrasound is a type of sound that is inaudible to the human ear.

Debuccalization refers to the phenomenon in phonetics where a specific sound is pronounced outside the oral cavity.

Thinking sensibly, that plan will not succeed.

He has astronomical knowledge.

Knock-knock, someone is knocking on the door.

He is interested in ichthyological research.

He cut the apple.

He rejoiced when he heard about the success.