What is that target?

He is my biggest enemy.

His advice was very practical.

His target-like way of thinking is hard to understand.

In order to reduce food waste, we should plan our food consumption.

He always proactively suggests new ideas.

My father is an ichthyologist and has a deep knowledge about marine life.

He always likes to be pedantic, explaining things down to the smallest detail.

He is a beginner in Japanese.

He is a world-renowned biologist.