He is an expert in ethology.

We went on a trip using the expressway.

My younger brother got infected with pinworms.

My younger sister got infected with pinworms.

This 蟯蟲 is a very rare type of parasite.

When summer comes, we take measures to repel insects inside the house.

It's a natural phenomenon for newborns to secrete witch's milk.

She is the owner of a 'kijitsu'.

He was entirely engrossed in his work.

He is experiencing the stage of bardo, according to the teachings of Tibetan Buddhism.