行星

Because of the fact, the bearing capacity of the whole drive cannot be developed well enough. To improve the performances of the load-capacity, transmission efficiency, and reliability of mechanical drive, we originally developed some designs of the double crank ring-plate-type cycloid planetary drive. The new-type drive keeps all the natural advantages, which is of multi-tooth mesh, small mesh angle, and hardened tooth flank of gears. Moreover, The drive does not need the special output unit as the ring-plate-type drive does, so that the rigidity of the output shaft becomes much higher. Since the tumbler bearing is placed outside the cycloidal gear, the size of the bearing is no longer restricted to any extent.

为大幅度提高其承载能力、传动效率和可靠性诸指标，我们创新研究出来的多种结构双曲柄环板式针摆行星传动，其特点是不仅保留着原摆线针轮行星减速器同时啮合齿数多，总法向力与总圆周力间夹角小，摆线轮与针轮齿均为硬齿面等本质上的优点；而且又具有环板式传动省去输出机构且输出轴刚性好，转臂轴承移至行星轮外，从而传递的转矩可以成倍提高的优点。

It was researched into the coupling form between three-row planetary gear train and shift restriction based on the matrix, and then the method of establishing mathematics model was presented for to analyze the planetary gear transmission by using MATLAB.

基于矩阵理论对行星齿轮变速机构的行星排之间联结、换档约束进行研究，提出用联结矩阵的组合形式建立三排行星机构传动型谱的概念，分析其所有可能的传动结构型式。

It was researched into the coupling form between three-row planetary gear train and shift restriction based on the matrix, and then the method of establishing mathematics model was presented for to analyze the planetary gear transmission by using MATLAB.

摘要基于矩阵理论对行星齿轮变速机构的行星排之间联结、换档约束进行研究，提出用联结矩阵的组合形式建立三排行星机构传动型谱的概念，分析其所有可能的传动结构型式。

In support of the asteroid-impact model, it had been argued that the gradual cooling of the average ocean temperature would enable progressively smaller asteroid impacts (which are known to occur more frequently than larger impacts) to cool the Earth's climate sufficiently to induce ice-cap growth and reversals.

为了支持行星带影响模型，提出了这样的一个观点，这个逐渐的变凉，平均海洋温度变凉，这个逐渐的变凉会使得递进式地更小的行星带的影响（这个行星带被认为更加频繁地发生比起更大的影响）去降低地球的温度，降低地球的温度怎么样呢？充足到导致IC的增长和R。

In fact, 21st century astronomers would classify it as a Planetary Nebula, but it's not a planet either, even though it may appear round and planet-like in a small telescope.

事实上，21世纪的天文学家将该天体归类为行星状星云，但是它也不是一颗行星，尽管通过小型望远镜看，它的外观可能呈圆形、类行星状。

Well, 20th century astronomers would classify it as a Planetary Nebula ... but it's not a planet either, even though it may appear round and planet-like in a small telescope.

在21世纪，天文学家会将它分类为行星状星云，但是实际上它也不是行星，只是用小型的望远镜观测时，它具有行星的圆盘状外观而已。

Another method, called microlensing--in which a planet's gravity momentarily brightens a background star by bending its passing light--is particularly good for detecting planets more distant from their stars and in principle could spot lightweights with masses down to that of Earth.

另一种方法即所谓的透镜--其中一颗行星的引力通过弯曲经过的光线瞬间增亮背后的恒星—-对于探测距离恒星更遥远的行星是特别好的，并且在原则上可以透过降落到地球上的物质发现轻量级的行星。

The metallicity excess could result from either the accretion of planets/planetesimals on to the star or the protostellar molecular cloud.

含金属过多是由行星/行星原质或原始恒星分子云的吸积引起的。同时，这种过金属性质也表现在类太阳&有行星&恒星中（参见图表2c）。

A planet on the other hand is built up out of the dust that surrounds a star. When a star is formed there is still a disk of gas surrounding it. As this gas cools, it condenses and forms solid grains. These grain particles accrete into large bodies called planetesimals, which then collide and accrete to make protoplanets. These protoplanets evolve into planets like the planets in our own solar system.

行星演化与恒星不同：恒星形成之后，周边的气体尘埃云冷却之后凝结形成，成为行星雏形，众多小行星雏形聚合碰撞，演化成成熟的行星；没有内部的核聚变；质量超过木星13.6倍，就会产生核聚变，如果还未至木星86倍，尚处于棕矮星的阶段，将会向恒星演化；持久的核聚变需要足够大的质量来支撑，温度也不足支撑氢向氦的转变。

Frozen and lonely, planet X circled the far reaches of the solar system awaiting discovery and a name. It got one thanks to an 11-year-old British girl named Venetia Burney, an enthusiast of the planets and classical myth.

清冷的行星X围绕着太阳系的远端运行，它等待着被发现等待着被命名，由于一个对行星和古典神话痴迷的11岁的英国女孩Venetian Burney，这颗行星才拥有了自己的名字。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。