【gress】
=grad, gred
“to go” "去，达到；运转"
|digress=di+gress v.(话、文章等)离题；走向岔道
di-“分开”
eg：Tell me what happened, and don't digress the way you usually do.
|transgress=trans+gress v.超过（限制、范围）；违反（法律、条约、合同）
trans-"超过，超越"
eg: It's not my habit to transgress the law.
|retrograde=retro+grad a.后退的，退化的 v.后退，退化
retro-"后退"
eg：I retrograde but i can't give up.
【词汇扩展】
degrade v.是降级，降低...的地位
centigrade a.摄氏度的
gradation n.（逐渐的）变化
aggressive a.挑衅的
（以上均来自《200个一定要学的英文词根词缀》一书）
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