He was staring at the horizon.

I inherited my X chromosome from my mother.

We will play 3x3 basketball.

This puzzle is composed of a 3x3 grid.

The study of cosmic rays may hold the key to unraveling the mysteries of the universe.

She is good at playing the shamisen.

He is good at playing the shamisen.

I became a little worried when I saw stretch marks appearing.

This electronic device uses polyurethane-coated copper wire.

She got a run in her new tights.