小群

Various forms of wave equations, definitions of wave number and frequency, derivations of phase speed and group velocity, and a quick discussion on dispersion relationships.

各种形式的波动方程，波数和频率的定义，相速度和群速度的引入，以及一个关於色散关系的小讨论。

This paper gives group representation of the spherical rotor in three-dimension space; it searches the rotor orientation in state space that consists of outputs of 96 sensors, but traditional single-nod-search method may get into local minima.

对转子球体的三维旋转进行了群描述；针对96个传感器的输出所构成的位置空间进行搜索，而传统的单点搜索会陷入局部极小值。

One pup, young and scrawny, with a splotch of white on its brown face, whined piteously at the fringe of the mob, unable to compete with the larger dogs.

一只很小很瘦的狗，它褐色的脸上有一块白斑，在这混乱的狗群边儿上，无法和大个儿的狗竞争，它可怜地哀鸣着。

That may not sound like much, but in a year with record-low numbers of sunspots and long stretches of utter spotlessness, five is significant.

大卫说：上个月，我们统计到有五组太阳黑子群，这或许听起来不算什么，但是对于在太阳活动极小年中，特别是在过去两年黑子数量创出新低，甚至有时还无黑子的情况下，出现这些数量的黑子意义却有不同。

A method to evaluate spatial straightness errors adopting particle swarm optimization is proposed.

摘要提出了一种满足最小区域法的空间直线度误差评价的新方法一粒子群算法。

Thence he shall command an agreeable, if no very noble prospect; and the Sunrise, he will be contentedly aware of a sort of morning hour upon all sublunary things ,with an army of shadows running speedily and in many different directions into the great daylight of eternity.

从那里，他虽看不到什么宏伟的壮观，却能俯瞰一片赏心的小景。当别人都在观看东方与西方、恶魔之王与黎明之神，他却怡然自得地注意：当清晨降于大地万物，大群阴暗的幽灵都向着四面八方仓皇逃入永恒的白昼之中。

And IE two-step method for the testing of T cell subpopulation shall be popularized in medium or small hospitals.

免疫酶二步法检测T细胞亚群可在中、小医院应用推广。

In the distance, a swarm of small craft scattered into the clouds.

在遥远之处，一群小的飞机进入云之内散布。

A new method based on wavelet decomposition and particle swarm optimization is put forward for rigid image registration.

本文提出了一种基于小波分解和粒子群优化算法的图像配准新方法。

The Trap - A million flamingos swoop down on Lake Bogoria in East Africa.

深海争霸：几百万条小沙丁鱼沿着非洲海岸迁徙，遇上一群饥饿的鲨鱼、海豚、海豹和塘鹅……危机四伏：一百万只红鹤寄居东非的博格利亚湖，纵然危机从上至下而来，它们仍留在这里生活、繁殖……死亡渡河：角马为寻找新鲜草地，冒死穿越塞伦盖提平原，途中遇上地球上最凶悍的陆上猎人……瀑布求生：数以亿计的三文鱼每年都要返回出生地--亚拉斯加，但前面危机重重……极地觅食：南极的企鹅面临生死考验。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。