外行星

In addition to the sun, other stars may also have their own planets, broadly speaking, any movement around the star, the quality does not meet the thermonuclear reaction can produce the quality of the main sequence stars the approximate lower limit of spherical objects can be called planets .

除太阳外，其他恒星也可能有自己的行星，广义上说，凡是环绕恒星运动的，质量未达到能产生热核反应的主序星质量下限的近似球形的天体都可称为行星。

In order to exploring the comprehensive methods of plan of transmission of four planetary line gearbox,this paper theoretically integrated the planetary transmission schemes by applying topological diagram s,and studied the comprehensive method of the transmission scheme topological diagram s of four planets.

为了探讨四档位行星变速箱传动方案综合方法，应用图论理论综合行星齿轮变速箱传动方案，研究了4个行星排变速箱传动方案拓扑图综合方法，该方法通过4个行星排拓扑图中基本构件的不同方式的相互结合，能综合出不同的变速箱传动方案；推导了依据给定的变速箱外传动比，计算了每个行星排内传动比的表达式，并编写了计算机辅助综合变速箱传动方案软件。

In determining the power spectrum of the wind, Lomb-Scargle periodogram was used.The planetary waves with periods 120 hours,60hours and 35 hours, diurnal, semidiurnal and terdiurnal tides were found at height 86.4km in the zonal wind.

首先利用Lomb-Scargle周期图方法计算了大气纬向风场的功率谱，除了行星波和潮汐外，在行星波、潮汐的频率和与频率差处有明显的谱峰，双谱分析表明这些谱峰是行星波和潮汐相互作用形成的。

And we're just now announcing the discovery of the fifth planet, the first planetary system with five full planets orbiting a sunlike star.

同时我们刚刚发现的第五颗行星，是之成为太阳系外的第一个拥有五颗行星的星系。

Although there's no way that this particular planet could support life, being able to spot carbon dioxide in its atmosphere offers hope for probing the atmospheres of planets more like Earth — and so bolstering the search for life outside the Solar System.

尽管这颗行星是否有生命的存在还没办法知道，但是从该行星的大气中可以发现二氧化碳带给了人们去寻找大气层更加接近地球的行星的希望，也给人类在太阳系外寻找生命迹象起到了支撑作用。

He suggested the following figures should be multiplied: how many stars are formed in the galaxy in a year; what fraction of these have planets and thus form solar systems; the average number of planets per solar system that have the potential to support life; on what percentage of those where it is possible do such biospheres actually form; what percentage of such biospheres give rise to intelligent species; what percentage of intelligent life is able to transmit signals into space; and for how long could such intelligence keeps sending signals.

他的方法包括一系列应该纳入考虑范围的数据：银河系每年新诞生的恒星数；拥有行星并组成了星系的恒星比率；有可能会出现生命迹象的行星平均数；以上行星能够真正孕育生命的比率；演化出了智能物种的比率；能使用无线电通讯与外太空联系的智能生物比率；智能生物使用无线电通讯方式的持续时间。更多信息请访问： http：//www.24en.com

He suggested the following figures should be multiplied: how many stars are formed in the galaxy in a year; what fraction of these have planets and thus form solar systems; the average number of planets per solar system that have the potential to support life; on what percentage of those where it is possible do such biospheres actually form; what percentage of such biospheres give rise to intelligent species; what percentage of intelligent life is able to transmit signals into space; and for how long could such intelligence keeps sending signals.

他的方法包括一系列应该纳入考虑范围的数据：银河系每年新诞生的恒星数；拥有行星并组成了星系的恒星比率；有可能会出现生命迹象的行星平均数；以上行星能够真正孕育生命的比率；演化出了智能物种的比率；能使用无线电通讯与外太空联系的智能生物比率；智能生物使用无线电通讯方式的持续时间。

This research applies the micro forming process with other mass production techniques to construct the key components of the micro/meso gear transmission. The final prototype is the planetary gear transmission with outer diameter 6mm and gear module less than 0.15mm developing in 3 years. The purposes and developing technologies of this project are as follows: 1. setting up the design and analysis of parts and system; 2. the mold design of gear and planet plate; 3. assembly modules of planetary gear train; 4. inspection of gear profile and gear train; and 5. heat treatment of micro parts.

本研究将以精微成形技术搭配其他量产制程，逐步开发微型减速机内的所有关键零件，预计在3年内最终完成外径≦ψ6mm、齿轮模数m≦0.12mm之的行星式齿轮减速机的开发，研发目标包含有微型传动系统结构/机构与零组件设计分析技术，试量产型精微行星/太阳齿轮、传动盘、环齿轮等原型件模具设计与开发，行星臂、太阳齿轮、行星齿轮与环齿轮等组装模组技术，微型齿轮齿形及相关微型齿轮箱检测技术，以及精微元件热处理技术等关键技术。

The Smithsonian's Robert Noyes told a news conference ,"The planet is the largest planet that has ever been seen, inside our solar system or out, and it's the least dense planet."

史密森尼学会的 RN 在一个新闻发布会上谈到：这是迄今为止所发现的最大的行星，不论在太阳系内还是外太阳系外，也是密度最小的行星。

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。

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。