He narrowly won the game.

He has a violent and reckless character, often acting before thinking.

He is studying the shape of the inner lip of the shell.

Learning the rules of the new kana is difficult.

He is an expert in ethology.

We went on a trip using the expressway.

He is the main organizer of this event.

He is struggling with his exam studies.

He is struggling with the new project.

In organic chemistry, cyclobutane has a structure in which four carbon atoms are bonded in a ring.