My major is oceanography.

Marine pollution is a global issue, and all countries should cooperate to find a solution.

His body is very healthy.

He made three robots.

He exercises his body every day.

His body looks like that of an athlete.

His body build is like that of a sports player.

There are only inanimate objects in this room.

The use of bioweapons is prohibited by international law.

The study of nekton is an important part of marine biology.