In vertical writing, 'left' is read from top to bottom.

Please turn to the left.

His Japanese language ability is not so high.

He is holding a pen in his left hand.

The problem with his right ventricle is having a serious impact on his health.

His words had a great influence.

The environmental issues are becoming more serious.

Environmental issues are becoming more serious day by day.

That decision had a bad effect on our project.

He exercises every day and leads a healthy life.