translation.en: It's because we don't think rocks can suffer. And if we're more concerned about our fellow primates than we are about insects, as indeed we are, it's because we think they're exposed to a greater range of potential happiness and suffering.
translation.zh: 因为我们不认为石头会受折磨 如果和昆虫做比较 我们比较关心我们自己的物种 那是因为我们认为我们比昆虫 能感受到更大程度的快乐或痛苦