Looking at the cirrostratus clouds spreading across the sky, I felt that rain was near.

Altostratus clouds are spreading in the sky, it looks like it's going to rain.

There were large stratocumulus clouds spread across the sky.

My great-grandfather was a doctor.

I saw a dollarbird in the park.

There are many large moso bamboos growing in this park.

The special theory of relativity is a theory proposed by Einstein.

Maoism is an important element in forming Chinese communism.

It is very dangerous if the battery causes thermal runaway.

He is immersed in the study of Tang-Song phonetics.