(每日一词）compulsion

Compulsion  /kəmˈpʌl.ʃən/ n. 强烈冲动；强烈欲望，难以抗拒的欲望

meaning: a very strong feeling of wanting to do something repeatedly that is difficult to control 

1) 前缀：com-全部

2) 词根：puls- 推，拉（助记：pull + push) 

3) 后缀：-ion 名词后缀

e.g. I seem to have a constant compulsion to eat. 我好像总有想吃东西的欲望。