VOA慢速英语:什么是慢性疲劳综合症？

unique – n. used to say that something or someone is unlike anything or anyone else

invisible – adj. unable to be seen; hidden

allow – v. to permit or let

diagnosis – n. the act of identifying a disease, illness, or problem by examining someone or something

exertion – n. physical or mental effort

bicycle – n. a vehicle with two wheels that is powered by two pedals

therapist – n. a treatment aide or specialist

pedal – n. an instrument pressed by the foot when riding a bicycle or playing a musical instrument

metabolism – n. biology: the chemical processes by which a plant or an animal uses food or water to grow, heal amd make energy

consequence – n. an effect, product or result