Keiou is my best friend.

Keito is my best friend.

He started a new business, but as the proverb 'the road to happiness is strewn with setbacks' suggests, he is facing many difficulties.

He is deeply studying the teachings of Prajnaparamita.

The vampire bat is active at night and sucks the blood of mammals.

He was diagnosed with acidemia.

I wonder where my sphygmomanometer is?

I was shocked by his cruel actions.

My grandfather has been suffering from high blood pressure for many years.

Stoichiometry is a method for calculating the amount of substances in a chemical reaction.