Mobile phones have become indispensable in our lives.

I felt his behavior was very free.

The characteristic of annelids is that their bodies are divided into ring-shaped segments.

It's difficult to understand the context of this sentence.

His first adjective is 'beautiful'.

He is an expert in international relations.

This book enlightened my thinking.

I am good at calculations.

He roughly carved the wood into shape.

My father has been suffering from sciatica for a long time.