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Human activities that have indirect effects on animals can be just as harmful. 1 当我们修建农场和工厂时, we destroy animal habitats and leave many animals with nowhere to live, 2 或者没有食物可吃. 3 We can also put animals in danger without ever entering their habitats. Air, water, noise and light pollution can all have a deep and damaging influence quite far from their source. Partly due to pollution caused by ship traffic and other human activities, 4 the dolphin population has dropped greatly. As the human population continues to grow, 5 so does the effect we have on animals.