1. Eletricity must be generated by the consumption of coal or oil
    发电需要消耗煤或石油.

2. The food is for our consumption on the trip.
    这些食物是供我们旅行用的。

3. Americans tend to become trapped in a working and spending consumption mode, driven by merchants, that leads them to rack up their expectations.
    美国人往往会陷入一种由商人们所鼓吹的工作-花钱消费的模式之中，这种模式引诱他们抬高了自己的期望值。

4. Yes, the earth's resources are not infinite; natural areas are being destroyed; the number of plant and animal species is declining; consumption of resources is expanding.
    是的，地球的资源不是无限的，自然界在遭受破坏，动植物的物种数目在减少，而资源的消耗却在增加。