His painting is drawn using the golden ratio.

He struggled to understand the object.

He is interested in learning the international language.

We need to combine our forces to make this project successful.

That plan is based on rational thinking.

Please research the interaction between these two drugs.

An old person was playing with his grandchild in the park.

Our school's motto is 'Knowledge is power.'

In Japanese, honorific language is an important way to show respect to others.

She is an expert in nursing.