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This paper studies chaotic motions in a nonlinear oscillatory system perturbed by external harmonic force and bounded noise excitation.

研究谐和外力与有界噪声激励联合作用下的一类非线性振子的混沌运动。

There is tight electromagnetic and mechanical coupling among 6-degree of freedom motions of magnetic levitation planar motor for photolithography.

用于光刻加工的磁悬浮平面电机的6个运动自由度之间存在着紧密的电磁和力学耦合。

One would approach at first warily through the shrub oaks, running over the snow-crust by fits and starts like a leaf blown by the wind, now a few paces this way, with wonderful speed and waste of energy, making inconceivable haste with his "trotters," as if it were for a wager,and now as many paces that way, but never getting on more than half a rod at a time; and then suddenly pausing with a ludicrous expression and a gratuitous somerset, as if all the eyes in the universe were eyed on him —— for all the motions of a squirrel, even in the most solitary recesses of the forest, imply spectators as much as those of a dancing girl —— wasting more time in delay and circumspection than would have sufficed to walk the whole distance—— I never saw one walk —— and then suddenly, before you could say Jack Robinson, he would be in the top of a young pitch pine, winding up his clock and chiding all imaginary spectators, soliloquizing and talking to all the universe at the same time —— for no reason that I could ever detect, or he himself was aware of, I suspect.

有一只赤松鼠开始谨慎地穿过矮橡树丛，跑跑停停地在雪地奔驰，像一张叶子给风的溜溜地吹了过来；一忽儿它向这个方向跑了几步，速度惊人，精力也消耗得过了份，它用"跑步"的姿态急跑，快得不可想象，似乎它是来作孤注一掷的，一忽儿它向那个方向也跑那么几步，但每一次总不超出半杆之遥；于是突然间做了一个滑稽的表情停了步，无缘无故地翻一个觔斗，仿佛全宇宙的眼睛都在看着它，——因为一只松鼠的行动，即使在森林最深最寂寞的地方，也好像舞女一样，似乎总是有观众在场的，——它在拖宕，兜圈子中，浪费了更多的时间，如果直线进行，早毕全程，——我却从没有看见过一只松鼠能泰然步行过，——然后，突然，刹那之间，它已经在一个小苍松的顶上，开足了它的发条，责骂一切假想中的观众，又像是在独白，同时又像是在向全宇宙说话，一我丝毫猜不出这是什么理由，我想，它自己也未必说得出理由来。

In addition, we prove that for a given set of camera motions such as {(R,t1),(R,t2)},if (t1 ,t2) are not linearly dependent, then the homography of the plane at infinity under this motion set can be linearly and uniquely determined.

另外同时给出了由极点确定关于无穷远平面单应性矩阵的充分必要条件。

The motions of plane and space curve have a wide range of applications.

平面和空间曲线的运动有着广泛的应用。

The theory of plate tectonics describes the motions of the lithosphere

板块结构理论描述岩石圈的运动。

The theory of plate tectonics describes the motions of the lithosphere, the

板块结构理论描述岩石圈的运动。

All his motions, as to be able to drop himself plumb down from the tallest tree-top , or

和建立"一个新的国家，一个民主的巴勒斯坦国"这样的美丽词语。

The massaging motions and pressure from the massager can help the skin renew itself and become plumper and smoother.

该按摩议案和压力，从按摩器，可以帮助皮肤自我更新，并成为plumper和畅通。

She just went through the motions of being a poetess.

她只不过装成一个女诗人。

In the days of sailing vessels the crew were afraid they would be becalmed on the ocean.

在使用帆船的时代，船员们担心他们会因为无风而无法在海洋上航行。

As long as foreign donors pay the PA's salary bill, few expect a new intifada.

只要外国继续为巴权力机构的薪水买单，希望发动新暴动的人便寥寥无几。