He had to pay a fine for a parking violation.

A neutron is part of an atomic nucleus.

The game was stopped due to sudden rain.

This rock contains a lot of neutral feldspar, especially andesine.

Neutron stars are known for their density and strong gravity.

His thesis is filled with a lot of comments.

He commented on the article.

He underwent surgery for appendicitis.

He is the center of the team.

He is good at abstracting the abstract points of the problem.