The two magnets are generating a repulsive force.

He used a magnet to collect iron filings.

It is difficult to predict the occurrence of earthquakes.

When the earthquake occurred, we evacuated immediately.

She had two apples.

I climbed the mountain using a compass.

He is an expert in embryology, studying the developmental processes of many kinds of organisms.

The process of embryogenesis is very complex, with continuous cell division and differentiation.

He and his twin brother are as alike as two peas in a pod.

He and his brother are as alike as two peas in a pod.