随着生态系统发生变化，沙漠面积不断扩大，粮食生产日渐减少，水源枯竭，人口也不得不迁移，搬到更适宜居住的地区。

As ecosystems change and deserts expand, food production diminishes, water sources dry up and populations are pressured to move to more hospitable areas.

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便宜的汽油和大量的鼓励信贷让许许多多的美国人迁移到南边的州和距离相对遥远的城市郊区（近郊繁华地区）来享受面积巨大的大房子。

Cheap petrol and ample credit encouraged millions of Americans toflock to southern states and to distant suburbs (“exurbs”) in search of bighouses with lots of land.

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作为VLS I互连线的金属薄膜的截面积越来越小，其承受的功率密度急剧增加，使得电迁移成为电路的主要失效模式之一。

Consequently, the metal interconnects of VLSI have smaller sectional area and carry increasing power density, which made the electromigration become one of the main latent damage modes.

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