He thought for a few seconds before giving an answer.

Let's compare the positions of point A and point B on the number line.

Adding fractions is difficult.

The beauty of the water and the moon soothes my heart.

The culture of Sweden is very attractive.

Natural numbers start from 0 and continue as 1, 2, 3, 4, 5, 6, 7, 8, 9.

The Reynolds number is an important concept in fluid dynamics.

He took a deep breath and inhaled the fresh air.

The dual number does not exist in English grammar.

The service life of this machine is 10 years.