Fermion is an important concept in physics.

He used to work as a miner when he was young.

We have launched a major campaign for the announcement of the new product.

We launched a large-scale advertising campaign to disseminate information about the new product.

The farmer is working in the field from early morning.

He used to work as a miner when he was young.

This equation needs a minus sign.

This kimono is what my grandmother wore for her wedding.

My paternal grandfather once traveled all over Japan when he was young.

Photoresist plays an important role in semiconductor manufacturing.