VOA慢速英语:妊娠期哮喘发作与健康问题

associate – v. to group an item or person with others by some common factor

data – n. facts or information used usually to calculate, analyze, or plan something

preterm – adj. born alive before 37 weeks of pregnancy are completed.

(birth) defect – n. a problem with how baby's organs or body parts form, how they work, or how the body turns food into energy.

symptom – n. a change in the body or mind which indicates that a condition or disease is present

chronic – adj. continuing or happening again and again for a long time

income – n. money that is earned from work, investments or business