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Secondly, the effectiveness and limitation of the classical perturbation, such as the method of multiple scales and the Poincare-Lindstedt method, are discussed in detail through a Duffing oscillator with delayed velocity feedback. It is shown that the two perturbation methods are effective only in solving the approximate solution of the first two orders. An ambiguity or paradox will be encountered when they are used to seeking for the third or higher order approximation of solution.

其次，以一具有时滞速度反馈的Duffing系统为例，研究了经典摄动法如多尺度法，Poincaré-Lindstedt法等在求解时滞微分方程级数解时的适用性和局限性问题，指出利用这些方法只能有效求得系统的前两阶近似解，而在求系统的三次以上近似解时会出现矛盾或二义性。

We offer a new method on studying the oscillation of higher order dynamic equation on time scales. And the results generalize the theory of continuous and discrete dynamic equation.

该文所用方法为研究时间模上高阶动力学方程的振动性提供了新的方法，且所得结果也统一和推广了连续和离散的动力学系统的理论。

The modulation of sound properties over a wide range of time scales is one of the most obvious characters of Oscine passerine\'s vocal, whose song contains many different kinds of syllables that consist of many more multiple song phrases. In oscine passerine, ipsilateral projections of RA to NXIIts innervates the ipsilateral syringeal muscles exactly, and thus they have strong ability of vocal control with variable tones, high frequency and higher lever of quality.

鸣禽鸣啭的最大特点之一便是其单次鸣唱时间长，鸣唱所包含的音节数量和音节种类繁多，因而由这些音节所组成的句型结构也是复杂多样富于变化，且由于NXIIts严格的侧别控制(每一侧核团只支配同侧鸣肌)，使其具有更强的控声能力，其鸣声音调变化幅度大，频率高，品质因数大，音色好，因而其鸣声也悦耳动听。

Four custom scales allow you to measure out of scale drawings.

四，您可以自定义尺度来衡量的尺度图纸。

The snake's body there are many scales, which is the outermost layer of their body armor.

蛇的身上有很多鳞片，这是它们身上最外面的一层盔甲。

What had been open, grassy space in the shadow of the Hayholt's outwall was now an infestation of wretched huts and tents, piled together and overlapping each other like the scales of an old, sick lizard.

Hayholt城堡的外墙，阴影下，曾经是一片空旷的草地，如今，那里搭起了小屋、帐篷，彼此拥挤，互相交叠，象是又老又病的蜥蜴身上的鳞片。

In the United States there was a larger pool of luck, and the overspill trickled down: extra toilet paper in the stalls, soup kitchens, social service programs, sliding scales, legal a...

在美国有更多好运、流溢惠及：卫生纸的摊位外，汤厨房、社会服务节目滑动尺度，法律甲。。

This paper presents an evaluation method based on psychological scale. Rank-order method or method of paired comparison is adopted to sort the images retrieved by different algorithms, then an ordinal scale is obtained. With presupposition of normal distribution, an equal interval scale is also obtained though POZ conversion. Thus different algorithms can be compared on these scales.

本文提出基于心理量表的情感图像检索性能评价方法，采用等级排列法或对偶比较法对不同算法检索出的图像进行排序，建立顺序量表，并在样本满足正态分布假设的前提下，将顺序量表转化成等距量表，以比较检索算法的优劣。

The Pangolin uses its scales as protection when it roles into a ball to sleep.

当缩成球状睡觉时，穿山甲将其鳞皮作为防身之物。

Pappus (p1.pappi) The ring of hairs,scales,or teeth that makes up the calyx in flowers of the ASTERACEAE.

冠毛：：由菊目的花中的花萼所形成的毛发状、鳞状或齿状物。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。