The theory of harmonic oscillators is a fundamental concept in physics.

His blood congealed with fear.

He quoted the proverb 'Once a word leaves your mouth, you cannot chase it back even with the swiftest horse' to teach me to choose my words carefully.

The International System of Units is a system of units commonly used worldwide.

In order to solve this quantum mechanics problem, we need to find the eigenfunction.

He is interested in learning the international auxiliary language.

This dress is made of georgette.

The two-humped camel is an animal adapted to live in the desert.

The one-humped camel lives in the desert.

He is interested in paleozoology.