To check this, we turn down the threshold level.
为了检验这一点，我们把阀值调低。
There is a threshold level of income which is completely free of income tax.
完全不用支付所得税有一个基准。
This threshold can either be at the warning or alarm level.
阈值可以在警告或警报级上设置。
This threshold can either be at the warning or alarm level.
阈值可以在警告或警报级上设置。
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