This case is outside of our jurisdiction.

His heart was enveloped in sorrow enough to break.

This column vector is a basic concept of linear algebra.

He encrypted the message using a public key.

You must never show this secret key to anyone else.

Let's exchange keys tomorrow.

He is good at playing the black keys.

She played the white keys of the piano briskly.

This string represents your name.

Liezi was a Taoist philosopher.