VOA慢速英语:尼日利亚的“双子城”有大量的多胞胎

specific - adj. special or particular

identical - adj. exactly the same

twin - n. either one of two babies that are born at the same time to the same mother

concentrated - adj. existing or happening together in one place : not spread out

stew - n. a dish of vegetables and usually meat cooked in hot liquid for a long time

diet - n. the food that a person or animal usually eats

stimulate - v. to make (something) more active

okra -n. a tall plant whose pods are eaten as a vegetable and are used in soups and stews

yam - n. a long, thick root of a tropical plant that has rough brown skin and usually white or yellow flesh and that is eaten as a vegetable