He is a specialist in surgery.

He is feeling the difficulty of swallowing.

He swallowed a large apple with difficulty.

This mass-produced item has stable quality and is also reasonably priced.

He was able to overcome his obstacle.

She looked in the mirror and was bothered by her split ends.

He looked like he had succeeded.

It is important for each person to fulfill their role.

He acted according to my instructions one by one.

Male and female whales live in the deep parts of the sea.