His dog started to go into heat yesterday.

This gem luminesces under special conditions.

The gem emits light in the darkness.

The sale of the new product will start from next week.

The joy of drawing a green dragon in mahjong is exceptional.

A row vector is one of the basic concepts in linear algebra.

He achieved a quick kill in that game.

He performs his own sadhana every day.

I walk every day for my health.

I walk to the park every day.