... at a scale of 7.8 on the Richter calculations 里氏7.8级地动 rock 摇，撼动，使振荡 damage 侵害；损伤 ...
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本文给出一些充分条件，使振荡函数的含参量积分保持振荡性。
In this paler we give some sufficient conditions, such that integrals of oscillatory functions with a parameter remaining oscillatory.
阻尼：物理学中，指因能量耗散使振荡、噪音、交流电之类的振动所受到的遏制。
Damping: in physics, the restraint of vibratory motion, such as mechanical oscillations, noise, and alternating electric currents, by dissipating energy.
为了使振荡频率稳定并降低谐波失真，需要加入一个在震荡频率处能够提供单位增益的负反馈路径。
Additional negative feedback is provided to set loop gain to unity at the oscillation frequency, to stabilize the frequency of oscillation, and to reduce harmonic distortion.
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