He is a computer security expert, well-versed in the process of decryption.

It took him a while to decode the message.

He can speak German fluently.

He was advancing his work while muttering to himself.

He goes to the temple to learn the teachings of Buddha.

I have started learning Korean.

He didn't notice the error in the calculation.

He misunderstood my intentions.

She taught me the antonyms of 'wealth' and 'poverty'.

Having a face-to-face conversation with him always evokes a fresh feeling.