progress=pro+gress progressive=pro+gress+ive progressist=pro+gress+ist r...

pre - 向前，ante - 也代表向前re-往后，回retro-往后，回inter-中间，来回ex-pro-or-表人，而且代表层次较高的人...

ambulate=ambul+ate ambulation=ambul+ation ambulance=ambul+ance ambulator...

invade=in+vad+e invasion=in+vas+ion(vas=vad) invasive=in+vas+ive invader...

upgrade=up+grad+e downgrade=down+grad+e degrade=de+grad+e degradation=de...

error=err+or erring=err+ing aberrant=ab+err+ant aberrance=ab+err+ance ab...

accept=ac+cept acceptance=ac+cept+ance acceptable=ac+cept+able except=ex...