例句與造句

1. so power systems harmonic analysis is a significant aspect of power systems research . power system harmonic analysis was realized usually with fast fourier transform ( fft ), but the method exits spectrum leakage, and can not analyse all harmonic parameters exactly, such as frequency, amplitude and phase, in particular has big phase error
   電力系統(tǒng)諧波分析通常都是通過快速傅立葉變換(fft)實(shí)現(xiàn)的，但是這種方法存在柵欄效應(yīng)和頻譜泄漏，使計(jì)算出的諧波參數(shù)即頻率、幅值和相位不準(zhǔn)，尤其是相位誤差很大，無法滿足準(zhǔn)確的諧波測量要求。
2. It's difficult to find exit spectrum in a sentence. 用exit spectrum造句挺難的