英语翻译18.W:Do you understand why the local people are opposed

英语翻译18.W:Do you understand why the local people are opposed to the new dam up the river?M:They are worried about the potential danger if the dam should break.The river is very wide above the proposed site.1.对话翻译2.The river is very wide above the proposed site.中的above怎么解释呢？河在预订点之上？但问句the new dam up the river。意思是预定点在河之上前后矛盾怎么解释