In this chemical reaction, hydration plays an important role.

This area is rich in subterranean rivers, which serve as a source of groundwater.

My grandfather has traveled the world when he was young.

He played his trump card at the end of the argument.

This antique clock is something I inherited from my grandfather.

He is good at deciphering new music scores.

I always play golf with my friends on weekends.

He is good at writing and writes a diary every day.

He is a good correspondent, always writing letters.

Sending packages by surface mail takes time, but it is cheap.