The content of diacetyl is the decisive index to measure whether the beer flavor got matured. Its content above the taste threshold value in beer would result in unpleasant sour beer taste.

双乙酰是衡量啤酒风味成熟与否的决定性指标，其含量超过其味阈值，会给啤酒带来不愉快的馊饭味，影响啤酒风味。

youdao

Objective To investigate the relationship between taste recognition threshold to salt, salt intake and salt-sensitive blood pressure.

目的探讨盐阈、盐摄入量与血压盐敏感性之间的关系。

youdao

To prove that MTBE concentrations below the EPA's threshold still made water taste terrible, Summy unearthed documents like a 1983 Shell letter detailing that water was no longer drinkable where MTBE'S concentration was 7 to 15 parts per billion.

FORBES: Demonizing for Dollars