VOA慢速英语:机器狗能帮助老年痴呆症患者吗？

dementia – n. a mental illness that causes someone to be unable to think clearly or to understand what is real and what is not real

entrepreneur –n. a person who starts a business and is willing to take the risk of loss to make money

puppy – n. a young dog

interactive – adj. designed to respond to the actions, commands, etc., of a user

commercial –adj. related to the buying and selling of goods and services