most unbearable
释义
unbearable（难以忍受的，不能忍受的，经受不住的）的最高级形式;
例句:
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The most unbearable pain is invisible from outside.
最痛的伤口,从外面是看不到的.
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Unfortunately, the incredible highs have been tempered with the most unbearable of lows.
来自BBC
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Most people find PROP and PTC bitter, but not unbearable, while others don't taste it at all.
来自WSJ