The foundation stone of this building was laid 100 years ago.

He inherited an old family name.

This trajectory is proof of his journey.

This rock is mainly composed of calcite.

Amphibole, a type of mineral, is mainly found in igneous rocks.

There are many beautiful stalagmites in this cave.

He cut the dam and started to let the water flow.

He works at a textile spinning factory.

She spun cotton to make thread.

We need to enhance the security of this system.