数值效应是明显的：退化地区的鲑鱼数量比原始地区少；然而，栖息地的丧失也有可能减少遗传多样性。

The numerical effect is obvious: there are fewer salmon in degraded regions than in pristine ones; however, habitat loss also has the potential to reduce genetic diversity.

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同样，如果原始实例提供了数值，那么表格上的方框将是只读属性的。

Also, if the original instance provides a number, that square on the grid is read-only.

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我们可以通过显示准确的行数值和原始文件名称来做更多的有关错误信息的工作，但是这个实例显示的是基本的技术。

We could do a lot more with the error messages by showing the exact line number and source file name, but this example shows the primary technique.

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