VOA慢速英语:母乳喂养对母亲也是有益的

encourage - v. to make (someone) more likely to do something : to make (something) more appealing or more likely to happen

avert - v. to prevent (something bad) from happening

frowned upon - phrasal verb to disapprove of something

immune - adj. not capable of being affected by a disease

collaborate - v. to work with another person or group in order to achieve or do something : collaboration - n.

hormone - n. a natural substance that is produced in the body and that influences the way the body grows or develops

flexibility - n. capable of bending or being bent