他们被随机分为四组，并被置于不同等级的背景噪音环境中，从完全寂静到有50分贝、70分贝和85分贝的噪音。
They were randomly divided into four groups and exposed to various noise levels in the background, from total silence to 50 decibels, 70 decibels, and 85 decibels.
中国的火车根据各自的时速分为不同等级，以车票前的首字母或数字进行区分。火车票首字母分为以下几个等级。
Chinese trains are divided according to their speed into various classes, identified with different letters and Numbers. The letters refer to different classes.
中国的火车根据各自的时速分为不同等级，以车票前的首字母或数字进行区分。
Chinese trains are divided according to their speed into various classes, identified with different letters and Numbers.
将各故障分为不同等级，提出相应的容错控制方法，使车辆在发生故障时能最大限度地保持继续行驶的能力。
Tolerant control strategies are established based on different fault types so that vehicles can furthest keep running capacity.
将各故障分为不同等级，提出相应的容错控制方法，使车辆在发生故障时能最大限度地保持继续行驶的能力。
Tolerant control strategies are established based on different fault types so that vehicles can furthest keep running capacity.
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