The paper gives the upper-lower limit of a function and draws several deductions by proving them.
给出并证明了一个函数的上下限及其几个推论。
The critical frequency is the function of damping and can be made as small as possible through selecting suitable damping. However the critical frequency has a lower limit.
临界频率是阻尼的函数，选择合适的阻尼可使临界频率尽量小，但存在下限。
The critical frequency is the function of damping and can be made as small as possible through selecting suitable damping. However the critical frequency has a lower limit.
临界频率是阻尼的函数，选择合适的阻尼可使临界频率尽量小，但存在下限。
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