He was standing behind me.

He is as strong as an ox.

My brother is a famous biologist.

I use a tram for commuting every day.

It is rumored that he is a member of a secret society.

The continental slope is a part of the seafloor topography, connecting the continental shelf and the deep sea floor.

He is a world-renowned ichthyologist.

The SI system is a standard unit system used worldwide.

My uncle is a famous zoologist.

This ancient proverb, 'know the other side and yourself, and you will not be in danger in a hundred battles', teaches us the importance of understanding ourselves and others.