这种说法从一开始就将讨论引向两个极端，它使人们认为应这样对待动物：要么像对人类自身一样关切体谅，要么完全冷漠无情。

It leads the discussion to extremes at the outset: it invites you to think that animals should be treated either with the consideration humans extend to other humans, or with no consideration at a1l.

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这种设定有助于改善后代的遗传品种，使优秀的基因能够在优胜劣汰的进程中得以保存。这非常冷酷无情，但很有效果。

This agenda improves the genetic variety of offspring, and the greater the variety, the better our genes' chances of surviving into the future. Cold, heartless, but effective.

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但是MND无情的折磨着患者的同时，也使他们身边的人痛苦不堪，尤其打击人的是它是很难康复的。

But MND is relentless in its grinding down of both patients and those close to them, and it's a shock from which it is not easy to recover.

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