She used to be a prostitute, but now she has started a new life.

Will you marry me?

"Do you want to have a meal? Take a bath? Or choose me?" she said jokingly.

He was hiding the fact that he was an illegitimate child.

He is an expert in ethology.

We went on a trip using the expressway.

He is conducting research on superconductivity.

Arthropods are a large group of animals that include insects, spiders, shrimp, and crabs.

Homophonic words are difficult, aren't they?

He is majoring in zoology at university.