There are many big trees in the park.

He often forgets himself because he is too absorbed in his work.

Primates are a part of mammals, which also includes humans.

This new drug has a very high lethality.

He is a perfectionist, so he is very strict about his work.

He always looks at things like a pessimist.

He is always an optimist, believing in a bright future even in difficult situations.

He is a true humanitarian, always striving to alleviate the suffering of others.

He is a positivist who thinks based on scientific evidence.

He considers himself an existentialist.