He performs best under pressure.

He came down the stairs.

I enjoyed a date with him under the cherry blossoms at night.

I saved the draft.

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

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

An imaginary unit is an important concept in mathematics.

An astronomical unit represents the average distance from the Earth to the Sun.

This product has a very small assembly unit.

Satomi is my best friend.