7) 低能量比率 (Low Short-Time Energy Ratio) 低能量比率（LSTER）是指在一个片段内， 短时能量值低于短时能量均值 0.5 倍的帧数与一个 片段内总帧数的比值。
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文中通过能量比率(PER)的概念刻画了结构谐振中系统谐波成分的能量变化。
The energy ratio (PER) characterize the energy change of the resonant harmonic components of system.
虽然你能以最高比率给它们充电，但剩余的能量还是作为热量跑出来了。
Although you can charge them at the highest rate, the remaining energy still runs out as heat.
虽然你能以最高比率给它们充电，但剩余的能量则作为热量跑出来了。
You can charge them at maximum rate and the rest of the energy goes out as heat.
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