很少情况下，主要角色是两个，因为他们有冲突的用户界面需求。
In rare cases, two personas should be primary because they have conflicting user interface needs.
大选对于巴博而言是有风险的，他不可能通过公平竞争来获胜。2000年他是在其两个主要对手均被禁止参选的情况下才当选的。
An election will be risky for Mr Gbagbo, who would be unlikely to win a fair contest; both his main rivals were barred from running when he was elected in 2000.
2002年在南部非洲发生了转基因食品援助危机，一些国家主要出于社会经济方面的考虑不允许接受转基因食品援助，这种情况证明有必要扩大评估的范围。
The GM food aid crisis in southern Africa in 2002, where a number of countries did not permit GM food aid as a result of mostly socio-economic concerns, illustrates the need for broader evaluations.
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