He is suffering from Raynaud's syndrome.

We analyzed the data of the experimental group.

This colony is forming a unique ecosystem.

Suddenly, a rainfall that starts and stops abruptly began and then stopped immediately.

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He is studying the major ethnic groups in that region.

This species has different characteristics depending on its subgroup.

A meteor shower appeared in the night sky.

Finding an asterism is a great joy for astronomers.

Looking down at the sea, I could see a school of fish swimming.