conundrums
n.
谜，猜不透的难题，难答的问题( conundrum的名词复数 );
例句:
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Football and rugby union have provided these two conundrums about officiating.
来自THETIMES
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I see conundrums, dilemmas , quandaries , impasses, gnarly thickets of fateful possibility with no obvious way out.
眼看问题经纬万端,进退两难 、 入困境, 死路一条, 盘根错节的命定可能性,但找不到明显的出路.
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After all the conundrums of Hungary, the second Turkish Grand Prix promises much.
继匈牙利站所有猜不透的事之后, 第二届土耳其大奖赛许诺了太多.
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With five parties now the norm in German legislatures, such conundrums will surely become more common.
以如今五个政党在立法院的议席份额来看,以后类似的难题将会更加普遍.
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In fact there are more such conundrums in astrophysics today.
来自SA
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The success of IVF spawned social experiments and legal conundrums.
来自WSJ