以下为句子列表：
英文: RC and other relaxation oscillators just will not do since amplitude noise in whatever circuit functions as a comparator will appear as phase noise on the output signal.
中文: RC谐振器以及其它一些张弛振荡器不能满足要求，这是因为它们的核心是电压比较器，需要利用电压信号的波动（噪声）来获得稳定的输出，这种波动就构成了时钟的抖动。
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英文: Therefore a urea-containing ointment, established and approved in the treatment of senile xerosis was chosen as a comparator to evaluate the efficacy of Hirudoid.
中文: 因此，尿素软膏，作为被认可的用于老年性干燥症的常用制剂，被选为对照药物用于评估喜疗妥的疗效。
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