CONCLUSION: About half of the auditory thresholds in infants failed in the initial and secondary hearing screening are still in normal range.

结论：经听力初筛、复筛后未通过的婴幼儿，仍有约半数婴幼儿的听阈是在正常范围。

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"Sense, taste and smell and vision and hearing have a normal range, but there can be a hundred-fold between the ability of people to discern a taste or odour - it's not uncommon, " says Dietrich.

BBC: Is there really a north-south water taste divide?