VOA慢速英语:美国卫生署尝试测量疼痛水平

tolerant –adj. able to accept or deal with something

frustrating –adj. causing feelings of anger or annoyance

acupuncture –n. a method of easing pain or illness by placing needles into a person's skin at special places

pupil –n. the round center of the eye

stimulation –n. to make something more active

signature –n. a feature in the appearance or qualities of a natural object formerly held to indicate its utility in medicine

pattern –n. something that happens in a regular or repeated way

inflammation –n. a condition in which part of the body becomes red, swollen or painful