He is viewing that situation as a serious problem.

He views that situation as a problem.

Neutron stars are known for their density and strong gravity.

He is as stubborn as a head as hard as a stone.

He tripped over the pebble at his feet.

He picked up a stone and threw it.

A neutron is part of an atomic nucleus.

Harry was searching for the Philosopher's Stone.

My father is an excellent doctor.

His strong will led him to success.