He always keeps a smile on his face.

It's difficult to remember new words.

These two words always co-occur.

Let's examine the co-occurrence pattern of this word.

She had two apples.

He has the alias 'Genius' because of his talent.

He cut the apple into exactly two equal parts.

His heart was broken in two.

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.