他的目光变得冷酷无情。

His eyes had grown ice-cold.

《牛津词典》

但是，看似简单的能量摄入与能量消耗平衡式其实很复杂，而且在强大的生理需求和社会力量共同作用下，变得冷酷无情。

But underlying that simple energy-in, energy-out equation is a complex, and so far inexorable, interplay between powerful physiological and societal forces.

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不过，在这种情况下，西方的谨慎行为不仅有变得冷酷无情的风险而且还会产生适得其反的效果。

At this point, though, the West's caution risks becoming not just heartless but counterproductive.

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