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沧海逍遥: 金币+25, 翻译EPI+1, ★★★★★最佳答案 2015-04-14 22:04:35
如果用compared with...，后面需要用比较级结构。
Compared with the power spectrum of signal a, the power spectrum of signal b is narrower slightly, especially with a reduced high frequency energy.
或者：
The power spectrum of signal b is narrower slightly than that of signal a, with a reduced high frequency energy (我说的话会用a reduced energy at high frequency，但不知道合不合你们专业的说法).
如果变窄是因为高频部分的能量降低所致，则可以：
The power spectrum of signal b is narrower slightly than that of signal a because of its reduced energy at high frequency. |
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