大银行似乎已经发现：坏账的准备金提取周期即将到底波峰了。
The big Banks seem to think that the provisioning cycle for bad debts overall is at or near a peak.
时域平均法是从混有噪声的信号中提取周期性分量的最有效方法。
The time domain average method is an efficient method to extract period components from the signal mixed with noise.
若采样长度与回转速度不吻合，将会出现伪周期，使主值函数项中提取周期成分后的信号失实。
If sampling length doesn't adapt rotative velocity, the results of calculation by FFT or periodogram analysis will lead to pseudo-periods, which distorts the principal value function terms.
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