1. counter-
meaning: opposition, opposite direction-相反的，相对的
example: counter-attack, counteract
2. extra-
meaning: outside, beyond-外面的，超越的
example: extracurricular, extramarital
3. hemi-
meaning: half-一半
example: hemisphere
4. inter-
meaning: between, among-在...之间
example: interact, interchange
5. non-
meaning: absence, negation-非，无
example: non-smoker, non-alcoholic
6. post-
meaning: after in time or order-之后（时间上和空间上）
example: postpone
7. re-
meaning: again-再次
example: repaint, reappraise, reawake
