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先请看下面两个句子:The migrants come for the few available jobs,which are usually no better than ones they fled.移民可找到的工作寥寥无几,这些工作与他们原来所抛弃的工作同样恶劣。As can be seen in the case of Surtsey,volca-noes give warnings of their activity.正象人们从瑟尔塞岛的形成所看到的那样,火山向人们预告其活动情况。这两个句子中