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

Changes in atmospheric pressure can cause headaches.

In this forest, various organisms live by building a relationship of mutualism.

In ancient Japan, the Housou clan played an important role.

The phrase 'the good and bad deed cancel out' perfectly describes his past actions.

Ainoya-san is my best friend.

This rock is gabbro.

He cleaned the bowl of the pipe thoroughly.

The students lined up in response to the teacher's instructions.

We report the progress of the project based on the principle of reporting, contacting, and consulting.