马克思提出了一个新理论，认为历史变革是由于对立集团的冲突而产生的。
Marx produced a new theory about historical change based upon conflict between competing groups.
唯一有银行的城市是沙塔斯，银行连接了阿尔多和塞尔斯这两个对立集团。
The only city with a bank is Shattrath and the bank is tied into the Aldor and the Scryer opposing factions within the city.
这次危机的根源在于两个集团间的严重对立。
The crisis is rooted in deep rivalries between the two groups.
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