Oleum is a very dangerous chemical, and it requires great caution when handling.

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.

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

He is researching on the pathogenesis and treatment of early-onset diabetes.