更糟的是，专家评估的可用性问题通常并不准确。
Worse, expert reviews sometimes identify issues as being problems when they are not.
可用性权威Jacob Nielsen估计到，一个外部的可用性专家通常只能识别约35%的可用性问题。
Usability expert Jacob Nielsen estimates that a usability review by an outside expert only identifies 35% of usability problems.
专家说，拖延交货的真正原因可能出于技术性问题。
Experts say technical issues are probably the real reason for the delay.
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