He was returned to prison because he did not comply with the conditions of his parole.

Saturated fatty acids may increase the risk of heart disease.

He is an expert in international law.

He is an expert in gemology, and he is good at evaluating the quality of diamonds.

His work skillfully uses synecdoche.

Using a mnemonic, it became easier to remember new words.

It is important to learn the imperative mood in Japanese.

The imperial system is still used in some parts of America.

The Monte Carlo method is a mathematical technique for solving probabilistic problems.

He learned how to operate a mortar.