Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
decaffeinated – adj. not containing caffeine : having the caffeine removed
association – n. a connection or relationship between things or people
subjects – n. a person (or animal) used in an experiment, study, etc.
body – n. a group of things that are related or connected in some way
moderate – adj. average in size or amount : neither too much nor too little
moderation – n. the avoidance of excess or extremes, especially in one's behavior or political opinions
