形容词
中文翻译：亚阈值的
同义词：
['below-threshold', 'subthreshold', 'threshold']
例句：
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1. The researchers found that the concentration of the substance was below the subthresholdlevel.
研究人员发现该物质的浓度低于亚阈值水平。
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2. The experiment was designed to detect changes in the brain's activity below the subthreshold range.
实验旨在检测大脑活动在亚阈值范围以下的变化。
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3. The results showed that the subthreshold effects were not significant.
结果显示，亚阈值效应并不显著。