He is an expert in cryptography and is involved in the development of security systems.

The empress dowager is living quietly in the palace.

My new work clothes are very comfortable.

He started learning Ainu language.

I often play golf on weekends.

He was chosen to guard the president.

I like solving Tsumego problems.

We need to combine these data.

We have a responsibility to protect this world.

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