失去它们会打破其生存地的平衡。
然而,由于非法偷猎和生存地丢失,老虎也面临巨大的灭绝的危险。
However, the tiger is facing the grave threat of extinction due to illegal poaching and habitat loss.
是不是因为我们本就该是一个不断移动的物种,大量的奔走能让我们生存地更久些?
Is it because we're a mobile sort of animal, and we need to move around a lot, and might that help us, you know, live longer?
in spite of the fact that we take a variety of chemicals into our bodies in different ways and we have to do that to stay alive, but we have mechanisms to control this very well.
尽管事实是我们从不同途径,摄入各种化学物质以维持生存,但我们能够很好地控制它们在体内的总量
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