An identity matrix is a square matrix in which all the elements on the diagonal are 1 and all other elements are 0.

In this experiment, we will use the International System of Units.

I'm not in the mood to work.

He recognizes his success as being due to his heavy reliance on technology.

He is always heavily relying on his friend.

The International System of Units is a standard of measurement widely used around the world.

The International System of Units is the standard measurement system used by scientists all over the world.

He is learning Ancient Greek language.

Old Church Slavonic is the first language written by the Slavs.

Old Church Slavonic is the oldest recorded language of the Slavic group.