We don't need to reinvent the wheel.

Natural language understanding is an important field of artificial intelligence.

He is good at solving trigonometry problems.

This library adopts its own classification method.

He surprised people by using magic.

Ex post facto laws pose a problem for a fair legal system.

He conducted the trial based on common law.

There is a beautiful bamboo in my garden.

I have to attend court tomorrow.

He perfectly understands the correct orthography of Japanese.