The flow of the river is very quiet and comfortable.

Ryuu raised his axe.

My younger brother caught the influenza.

This fashion spread quickly.

He is an expert in fluid mechanics.

This area is equipped with a sewer installed by the prefecture, making life very convenient.

The Brachiosaurus was a very large dinosaur.

He said, 'It's difficult to make a life,' explaining the phrase 'When a man steps over the threshold, he has seven enemies.'

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.

His efforts were like a mantis trying to stop a chariot, he couldn't achieve any results.