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。
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.
声道分离度是FM立体声广播系统的一项重要指标，它是整个广播系统立体声听觉质量的一个决定性因素。
The Channel separation degree is an important index of the FM stereophonic broadcasting system, and itis also a decisive factor of aural quality in the whole system.
视距是热成像系统的主要战术指标，对系统的设计具有决定性作用。
Visual range is a primary tactical index and has decisive influence on the design of system.
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