The poster girl of that shop is very kind and always welcomes customers with a smile.

We need to solve the problem in the production environment.

We play golf at the country club on weekends.

I am learning Simplified Chinese.

My friend works at a commercial broadcasting television station.

This compound has cyclohexadecane as its main component.

I used cyclononadecane in an organic chemistry experiment.

This compound contains cyclotetradecane.

This compound mainly consists of cyclotridecane.

The theory of metric spaces plays an important role in many areas of mathematics.