哈雷希望看到计算内容，仍然停留在固有力（inherent force）和强迫力（imPressed force）这样两个基本概念上，他用了八九个月写成，这一点就很容易理解，很难显示电力的性质，“满地”都有珍宝可拾，推出了使行星保持在...
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等效强迫降低出力小时 equivalent forced derated hours
用武力或强迫手段 by force
强迫降低出力运行小时 in-service forced derated hours
强迫劳动力 Forced Labor
热力强迫 thermal forcing
局地热力强迫 localized thermal forcing
通过数学分析得出振动质点的速度与强迫力之间的相位差。
The phase difference between velocity of vibrate particle and force was analysed.
当基流为静止大气或全球东风时，热带外强迫力只能在其附近激发很弱的扰动。
When basic flows appear in the form of stationary atmosphere or global easterly, the external forcing in the tropics triggers only a weak disturbance in the vicinity of itself.
正是有这一相位差，才使强迫力对振动系统所做的功正好抵消阻尼力对振动系统所做的负功，以保证稳定振动的等幅性。
This leads to the result that the work of force counteracts the work of damp force, and that the swing of steadily oscillation is the same.
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