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.

He is undergoing physiotherapy for his leg injury.

The Minister of Justice submitted a new law proposal to the parliament.