implacable

It is conceivable that animals who are too stupid to be quiet on their own initiative are, during periods of high risk, immobilized by the implacable arm of sleep.

可以想像得出，在危险之时刻，那些由于太愚笨而不能自动保持安静之动物，会不由自主地变得动弹不得。

A Soviet military officer named Dmitri Polyakov, posted to New York in the 1960s, was refused permission by an implacable Moscow to take his fatally ill son to a U.S. doctor.

1960年代，一位被派驻纽约的名叫德米特里•波利亚科夫（Dmitri Polyakov）的苏联军官要求把他病入膏肓的儿子送到美国寻求一位医生的救治，遭到了莫斯科方面毫不留情的拒绝。

There must be implacable determination to see the right done, but strong purpose, which does not flinch because some must suffer, is perfectly compatible with fairness and justice and a clear view of the actual facts.

要保证事情做得对必须有坚定的决心。不因为有人得付代价而轻易动摇的“执著”，与公平合理、明察事实并无矛盾。