His piano performance was of amazing skill, and all the audience held their breath.

Understanding the principles of electromagnetism is difficult.

It will probably rain tomorrow, I know.

It will probably be sunny tomorrow.

A salt pan is an important facility for making salt from seawater.

She is training at the Buddhist nunnery.

He crossed his arms while thinking.

He always crosses his arms when he is thinking.

This area is rich in peat.

This pasta is hard to eat because it has uneven cooking, some parts are hard.