结果证明，由于深层次的原因，排序是许多性能难题的核心所在。
Sorting turns out to be at the heart of many performance challenges for a deep reason.
议案的弱化表明了限额交易制度的一个核心难题。
The weakening of this bill illustrates one of the central problems with cap-and-trade systems.
还有另一条坏消息必须考虑不容忽视，因为它直指索兹伯格家族所面临难题的核心。
There is one other piece of bad news that needs factoring in, not least because it goes to the heart of the conundrum facing the Sulzberger family.
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